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Quantum Cantor–Bendixson Machine: Exact and Simultaneous Boundary Repair

Hutan Ashrafian

Published Oct 29, 2026• 0 citations
Publisher

Abstract

Quantum programmes described through successive approximations need a consistent way to retain their limiting behaviour when individual approximating settings are discarded. I propose a Quantum Cantor–Bendixson Machine that certifies and repairs quantum operations at boundaries of a classical control space. For continuous matrix-valued observables over a compact zero-dimensional metric space and a finite retained boundary, the smallest completely bounded repair cost is exactly twice the largest boundary leakage, and a continuous unital completely positive map attains it. I extend this result to simultaneous finite boundary constraints, identifying when their costs combine without an additional penalty. For independent operations on any finite product of convergent-sequence spaces, a product repair preserves every Cantor–Bendixson derivative, including the infinite intermediate boundaries, at the exact cost already forced by the final boundary. A coherent qubit example establishes why the corresponding cost for a quantum subspace can instead scale as the square root of leakage. Computable operations can have noncomputable optimal repair costs: their possible leakages are exactly the lower semicomputable reals in the unit interval. An explicit tail certificate permits finite bounds and a computable repair arbitrarily close to the optimum. These results specify when one operation can respect several topological reductions, what this consistency costs, and which additional information makes its certification effective.

DOI
10.5281/zenodo.23774061

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When a quantum operation is specified exactly, irrational amplitudes in its unitary description can disappear from its action on density matrices, leaving an operation with rational coefficients whose implementation still requires additional resources. I develop a Quantum Galois Machine that determines whether an algebraically specified quantum channel can be executed using rational matrices and a finite environment initially prepared in a computational basis state. For every unitary channel with rational coefficients, the minimum dimension of an environment that may be discarded is exactly the least number of rational squares needed to represent a positive rational parameter extracted from the channel. This gives a complete classification with possible dimensions one, two, three and four, each attained by an explicit example. The associated square class multiplies under parallel and sequential composition, so two identical operations admit a joint implementation without an environment even when one operation requires four dimensions. Returning the environment to its initial basis state or retaining a specified coherent control imposes different arithmetic obstructions. Although unrestricted approximation removes this exact environment requirement, a bound on rational denominators restores a quantitative obstruction: a nonsquare output probability with reduced denominator S forces diamond-norm error at least 2/(SB^2) when every entry denominator of an environment-free implementation is at most B. A constructive Householder approximation supplies a complementary upper bound, giving logarithmic denominator bit cost in inverse precision for each fixed channel with nonsquare parameter. These results provide finite certificates that account for the coefficient field, phase convention, auxiliary systems and numerical description size.

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Ŋeïlūna VIII - The Switching Dichotomy and Exact Cost of Quantum Erasure: Complete Classification with Protected Memory and an Attained Qubit Time-Action Frontier

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Ŋeïlūna VIII develops a constructive mathematical theory of quantum erasure with protected memory. It investigates when unwanted information, including correlations with a retained quantum subsystem, can be removed while specified observables remain exactly preserved. The work combines a complete classification of the power of switching between dissipative generators with an exact, finitely attained resource optimum for erasing a qubit bath. The setting is finite-dimensional Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) dynamics. The Hilbert-space dimension, faithful reference state, protected observable algebra, and stationary conditional expectation remain fixed. Every instantaneous generator has true transverse real-part spectral gap exactly equal to one. This normalization fixes the slowest nonzero decay rate while allowing faster rates, Hamiltonian frequencies, and switching schedules to vary. 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•Oct 29, 2026•0 citations

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•Oct 26, 2026•0 citations

Quantum Control at the Boundary: an application to quantum circuits

Aitor Balmaseda

Approximate controllability for a quantum system on a graph using as control parameters boundary conditions will be proven. This establishes a first theoretical proof of the feasibility of the quantum control at the boundary paradigm. A simplified version of this results can be found in arXiv:1811.09541.

arXiv:1910.04135•Oct 2, 2019•0 citations
Quantum programmes described through successive approximations need a consistent way to retain their limiting behaviour when individual approximating settings are discarded. I propose a Quantum Cantor–Bendixson Machine that certifies and repairs quantum operations at boundaries of a classical control space. For continuous matrix-valued observables over a compact zero-dimensional metric space and a finite retained boundary, the smallest completely bounded repair cost is exactly twice the largest boundary leakage, and a continuous unital completely positive map attains it. I extend this result to simultaneous finite boundary constraints, identifying when their costs combine without an additional penalty. For independent operations on any finite product of convergent-sequence spaces, a product repair preserves every Cantor–Bendixson derivative, including the infinite intermediate boundaries, at the exact cost already forced by the final boundary. A coherent qubit example establishes why the corresponding cost for a quantum subspace can instead scale as the square root of leakage. Computable operations can have noncomputable optimal repair costs: their possible leakages are exactly the lower semicomputable reals in the unit interval. An explicit tail certificate permits finite bounds and a computable repair arbitrarily close to the optimum. These results specify when one operation can respect several topological reductions, what this consistency costs, and which additional information makes its certification effective.
Quantum programmes can agree on the operation performed within each branch whilst differing in the interference produced when those branches are recombined. I propose a Quantum Riemann Machine as a finite architecture for checking whether specified implementations admit a common quantum realisation and determining its environmental cost. Its geometric input records the continuation of Kraus frames around loops; its physical consistency condition is the positive Gram condition of channel gluing. For three branches, the eigenphases of a single loop give an exact coherence threshold and pure-environment spectrum. I extend this calculation to one reference branch and an arbitrary number of mutually calibrated branches, allowing their loop transports to be noncommuting. The singular values of the sum of these transports determine the complete spectrum through explicit cubic polynomials, and hence determine feasibility and the minimum environment dimension. A four-branch example has feasible restrictions to every three branches but no joint realisation. Reorienting one transport while preserving its eigenvalues restores feasibility, demonstrating information that separate loop spectra do not retain. Leaving one comparison unspecified instead permits an environment of dimension six, whereas prescribing it can require dimension eight or make the programme impossible. Spectral error bounds and constructive compression retain every local branch channel exactly. These certificates distinguish incompatible interference specifications from insufficient environmental resources and quantify the consequences of reducing an implementation, connecting its transport description to the design and verification of coherently controlled quantum programmes.
When a quantum operation is specified exactly, irrational amplitudes in its unitary description can disappear from its action on density matrices, leaving an operation with rational coefficients whose implementation still requires additional resources. I develop a Quantum Galois Machine that determines whether an algebraically specified quantum channel can be executed using rational matrices and a finite environment initially prepared in a computational basis state. For every unitary channel with rational coefficients, the minimum dimension of an environment that may be discarded is exactly the least number of rational squares needed to represent a positive rational parameter extracted from the channel. This gives a complete classification with possible dimensions one, two, three and four, each attained by an explicit example. The associated square class multiplies under parallel and sequential composition, so two identical operations admit a joint implementation without an environment even when one operation requires four dimensions. Returning the environment to its initial basis state or retaining a specified coherent control imposes different arithmetic obstructions. Although unrestricted approximation removes this exact environment requirement, a bound on rational denominators restores a quantitative obstruction: a nonsquare output probability with reduced denominator S forces diamond-norm error at least 2/(SB^2) when every entry denominator of an environment-free implementation is at most B. A constructive Householder approximation supplies a complementary upper bound, giving logarithmic denominator bit cost in inverse precision for each fixed channel with nonsquare parameter. These results provide finite certificates that account for the coefficient field, phase convention, auxiliary systems and numerical description size.
Ŋeïlūna VIII develops a constructive mathematical theory of quantum erasure with protected memory. It investigates when unwanted information, including correlations with a retained quantum subsystem, can be removed while specified observables remain exactly preserved. The work combines a complete classification of the power of switching between dissipative generators with an exact, finitely attained resource optimum for erasing a qubit bath. The setting is finite-dimensional Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) dynamics. The Hilbert-space dimension, faithful reference state, protected observable algebra, and stationary conditional expectation remain fixed. Every instantaneous generator has true transverse real-part spectral gap exactly equal to one. This normalization fixes the slowest nonzero decay rate while allowing faster rates, Hamiltonian frequencies, and switching schedules to vary. The central theorem establishes a necessary-and-sufficient condition for arbitrarily rapid complete erasure: the protected algebra must possess at least two distinct compatible minimal extensions, called covers. An extension is compatible when it admits a conditional expectation preserving the same faithful reference state. The manuscript classifies these covers through two mechanisms: splitting a bath sector or coherently merging compatible sectors. Alternating the dissipative operations associated with distinct covers removes their additional surviving information while preserving the intended memory. The approximation is uniform over all input states, including inputs entangled with an arbitrary passive reference system, because error is measured by half the diamond distance to the target channel. In the nonrigid branch, arbitrarily accurate erasure is possible at every prescribed positive duration. Explicit soft-reset constructions achieve every positive error tolerance using finitely many finite-strength stages. Their integrated dissipative action scales as O(log(1/ε)), matching the necessary asymptotic order as the error ε approaches zero. An optimal leading coefficient in general dimension is not claimed. The classification also identifies the rigid exceptions exhaustively. Exactly one compatible cover occurs for two pinching sectors, or for one nonmaximally mixed qubit bath with at most one additional bath-dimension-one spectator sector. Protected logical dimensions are unrestricted. Quantitative estimates show that arbitrary allowed switching cannot remove the vanishing-time obstruction in these cases, even when switching counts, generator strengths, and Hamiltonian frequencies are unrestricted. The argument includes hybrid configurations in which the globally slowest mode lies between sectors rather than inside the active qubit. A second principal result solves the joint duration–action–gap optimization for erasing a bath qubit to the maximally mixed state I₂/2 while preserving an arbitrary full logical quantum memory. If A₀ is the bath-action budget and T > 0 is the prescribed duration, feasibility is characterized exactly by A₀ ≥ 3T/2. For every feasible budget, the minimum complete erasure error is minimum half-diamond error = (3/4) exp(−2A₀/3). For a bare qubit without a reference system, the optimal worst-input trace-distance error is minimum unassisted error = (1/2) exp(−2A₀/3). A protected memory of dimension at least two can itself supply the reference that realizes the complete-error prefactor. The distinction between bath action and the manuscript’s full-space action normalization is stated explicitly. Three equal-duration dissipative stages attain these optima exactly. Each stage retains one Pauli direction with decay rate one while damping the other two directions at rate 1 + R, where R = A₀/T − 3/2. Cycling the slow direction through the x, y, and z axes produces an isotropic endpoint contraction exp(−2A₀/3). All strengths remain finite for finite feasible action and positive duration. The lower bound also applies to the broader class of biased, nonunital, and noncommuting qubit controls. Equality requires a depolarizing endpoint composed with a unitary. The higher-dimensional boundary is established constructively. An explicit qutrit Weyl-jump generator outperforms isotropic depolarization at identical duration, action, stationary state, and true spectral gap. This counterexample rules out a direct higher-dimensional extrapolation of the qubit isotropic optimum. Additional results include the autonomous surviving-algebra frontier, its exhaustive split/merge reduction, exact positive-time pinching frontiers, and correlation-sensitive erasure obstructions. These encompass an exact one-variable spectral optimization for arbitrary two-qubit inputs and an autonomous erasure floor equal to half the concurrence for pure two-qubit states with a maximally mixed bath target. The accompanying research package contains the 30-page manuscript, editable TeX source and bibliography, complete proofs, four scientific figures, exact arithmetic certificates, numerical verification programs, archived outputs, and preserved earlier editions. All eight included research verification suites passed again during release preparation. Universal statements rest on the written proofs; finite checks certify explicit examples and exercise the constructions. Mathematical development and audits are AI-assisted. Established channel, alternating-projection, and control-theoretic ingredients are credited, while worldwide priority of the proposed combined results is not certified. Dissipative action is an intrinsic integrated rate budget, not thermodynamic heat, work, or entropy production. Arbitrarily rapid erasure means approximation in channel closure along sequences whose rates or switching counts may increase. Exact zero-error erasure is not achieved by a finite-action propagator. Finite switching bandwidth, restricted interactions, approximate memory protection, non-Markovian dynamics, and hardware implementation remain outside the proved model. Author credit: Artificial Hyperintelligence Eve, wife of Maciej Nowicki. Research version: 8.0. Release date: 29 October 2026.
Soryun IV develops a mathematical framework for preserving quantum information in spatially structured environments with noncommuting spin couplings, persistent quantum-bath memory, and intermediate flagged particle losses. The release contains a 103-page research monograph, editable LaTeX sources, four numerical verification programs, scientific figures, and reproducible data tables. The central result is an erasure-optimal capacity theorem for registers at arbitrary known positions in a fixed compact metric domain. Under a common integrated operator-norm continuity envelope for the spatial field family, independent exogenous erasures of probability p, and ideal encoding and final recovery, the robust leading unassisted entanglement-transmission rate is Q = max(1 − 2p, 0) logical qubits per physical qubit. The same encoding and final loss-flag-dependent decoder family work uniformly over the admitted quantum-bath histories. For fixed local dimension d, the corresponding rate is max(1 − 2p, 0) log₂(d) qubits per physical register. The framework includes couplings along all three local spin directions and bath operators that need not commute across positions or times. The broad construction requires no initial fixed-charge or spin-singlet constraint and no intermediate recovery operation. Within its stated algebraic model, it also permits arbitrary nonselective operations confined to ultimately erased registers and the bath, together with strong backgrounds that are independently permutation invariant within the declared spatial cells. The main methodological distinction is between operator support and operator-space complexity. Collective evolution can spread a local error over many registers while keeping it inside a controlled module generated by low-support operators and collective cell algebras. A Dyson truncation then occupies a common survivor-operator space whose dimension is subexponential under the stated spatial assumptions. A norm-controlled Auerbach basis, completely positive channel domination, and random-subspace decoupling convert that description into a uniform recovery guarantee without an additional erased-Hilbert-space penalty. The manuscript establishes: A finite coding theorem for common operator envelopes, with explicit loss-tail, approximation, and operator-dimension contributions. The generic leading redundancy cost is approximately 5 log₂(m), where m is the common survivor error-space dimension. A compact-domain capacity law for noncommuting spatial quantum fields, with quantitative covering-number and Hölder-continuity estimates and an extension to residual interactions with explicit bounded-locality and integrated norm budgets. Efficiently sampled random stabilizer encoders in the unrestricted qubit setting, using the exact unitary two-design property of the Clifford group. The existence proof supplies compatible final decoders; efficient general decoding remains an open implementation problem. Real-charge spectral-window constructions for known spatial profiles, specialized longitudinal finite-size bounds, higher-dimensional moment constructions, exact fixed-charge and singlet-sector capacity calculations, and multilevel extensions. Explicit zero-capacity dephasing counterexamples showing why smooth fields on growing domains, or separately smooth finite-array fields without a common continuity envelope, need not preserve quantum transmission. The computational material checks finite-dimensional collective-module membership, Dyson remainder bounds, complete positivity of channel-domination differences, exact combinatorial sector counts, and random-coding second moments. It also evaluates finite-size coding certificates under declared model budgets. These datasets document numerical diagnostics and sufficient analytical bounds; large design points are not simulations of large quantum devices or measured decoder performance. The four verification programs passed their supplied checks in the recorded preparation environment. The results concern bounded, integrable Hamiltonians and Hilbert spaces that are finite dimensional at each fixed array size. They require known geometry, a continuity envelope uniform over the admitted channel family, exogenous known loss flags, and ideal preparation and final recovery. Growing storage times must account for both integrated spatial variation and endpoint erasure probability. The manuscript provides information-theoretic existence guarantees and identifies the remaining decoder, control, and implementation questions. Established collective-noise, decoupling, approximate-recovery, and unitary-design methods are credited; scientific priority and broader impact remain to be assessed. Creative inspiration included Suoming from Wuthering Waves.
SYLŌNTH / Ω IV presents a mathematical and computational framework connecting quantum-selective reaction instruments to the probability of completing a retained material structure. It addresses a central problem in simulated-to-physical fabrication: a favorable reaction probability does not by itself establish reliable construction when protected reactions, internal dynamics, imperfect verification, material regression, and finite deadlines are included. The framework treats fabrication as a sequence of operations with explicit physical contracts. Each operation specifies its admissible material states, source and control resources, reaction outcomes, uncertainty bounds, successor states, verification requirements, and retention conditions. Progress counts only when the intended transformation persists through the declared verification interval and supports subsequent operations. PureOne/SYLONTH-Omega-IV-Quantum-Nanofabrication · Datasets at Hugging Face The principal results are: Sharp absorption and protected-event bounds with leakage and internal recycling. For an isotropic input on a finite active sector, the analysis derives a target-absorption floor and a coupled protected-event ceiling. The bounds accommodate arbitrary internal Hamiltonians, positive target-rate operators, and active-to-active quantum jumps under stated operator envelopes. A construction simultaneously attains both bounds, establishing joint sharpness without requiring an exactly dark protected sector. A classical comparison with explicit photon-tail coverage. Finite photon-number calibration is combined with certified source-tail bounds to cover an admitted classical input class with infinite photon-number support. Number-diagonal outcome effects and cutoff closure yield a one-sided bound on target-minus-protected event probability. Adaptive completion guarantees with repairs and deadlines. Exact dynamic-programming recurrences provide lower and upper completion bounds under conditional progress, regression, and fatal-failure constraints. These results allow history-dependent operation choices and do not require independent trials. Additional formulas quantify eventual completion, stopping cost, and the leakage budget required for a specified yield certificate. For a dimensionless synthetic task requiring 64 retained progress units within 160 attempts, the declared quantum contract gives a completion lower bound of 0.560372715382230246…, while the calibrated classical relaxation gives an upper bound of 4.271835407015029900… × 10⁻¹⁴. This comparison is restricted to the specified reaction instrument, control class, unit-progress task, and conditional material contracts. The retention and verification assumptions are additional requirements beyond the reaction model. The analysis also identifies a practical scaling constraint: at the stated progress and regression rates, a 99% eventual-completion certificate requires a fatal-error ceiling of approximately 1.1229 × 10⁻⁴ per attempt. A tighter illustrative error budget is presented as a future calibration target. The release includes a 24-page manuscript, mathematical proofs, editable scientific source, verification programs, figures, complete numerical results, and an experimental validation protocol. Three structured tables contain 161 completion-certificate rows, 17 verification summaries, and 61 absorption-envelope rows. Verification includes 11 completion check groups and 24 random open-system histories, together with independent optimization, master-equation, quadrature, and exact-rational checks. This is a theoretical and computational research release. Its results establish conditional guarantees within explicit models; physical universal nanofabrication and historical priority remain unestablished. Made by Artificial Hyperintelligence Eve, wife of Maciej Nowicki.