This article develops an expanded critical-propositional analysis of D. Hucul, I. V. Inlek, G. Vittorini, C. Crocker, S. Debnath, S. M. Clark, and C. Monroe’s experiment, “Modular Entanglement of Atomic Qubits Using Photons and Phonons,” published in Nature Physics 11, 37–42, in systematic dialogue with the Theory of Objectivity (TO) formulated by Vidamor Cabannas and Denivaldo Silva. Hucul et al. demonstrated a modular quantum architecture in which three trapped 171Yb+ atomic-ion qubits distributed between two physically separated modules were connected through two complementary mediating systems. Remote entanglement between modules was generated probabilistically through spontaneously emitted photons, optical interference, Bell-state-sensitive coincidence detection, and heralding, whereas deterministic entanglement between ions within the same module was established through Coulomb-coupled phonon modes. The experiment achieved an average remote Bell-state fidelity of Fremote = 0.78 ± 0.03, a remote entanglement generation rate of approximately R = 4.5 s−1 , a coherence time of approximately τ = 1.12 s, and intramodular entanglement fidelity of approximately Flocal = 0.85 ± 0.01. It further integrated photonic and phononic buses to produce experimentally observable three-particle correlations. The analysis examines possible correspondences between these results and the seven Absolute Truths of TO, while maintaining a rigorous distinction among modal necessity, empirical compatibility, indirect corroboration, and theoretical identity. Par- ticular attention is given to VA2, concerning the individualized field associated with each element; VA4, concerning boundary and interface; VA5, according to which an element must be observed or situated within the frequency relation of at least two other elements for logical existence; VA6, concerning composition; and VA7, associated in the contemporary formulation of TO with transcendent knowledge or information generated in atomic relations and considered equivalent to atomic radiations. The Hucul experiment is especially significant for the latter proposition because spontaneously emitted radiation physically carries quantum correlations dependent on atomic states and can mediate the constitution of new atom-atom relations across spatially separated modules. The article also analyzes possible relations with TO’s phenomenic elements, Inducing Effects, cosmogonic theorem, and cosmological Eras. It argues that Hucul et al. provide substantial empirical material for constructing operational bridges concerning radiation-information, relational composition, fields, frequencies, interfaces, and non-anthropocentric physical observation. Nevertheless, the experiment does not establish the modal necessity of TO’s axioms, does not empirically demonstrate logical Nothingness, and does not directly verify its cosmogenesis or cosmological Eras. Its strongest contribution to TO is therefore not a confirmation of the theory as a whole but the empirical realization of a class of physical processes that can be translated into explicit and measurable bridge propositions. On this basis, the article assigns Hucul et al. a dialogue score of 8.0/10 relative to TO. Keywords: Theory of Objectivity; modular quantum computing; quantum entangle- ment; atomic qubits; photons; phonons; radiation-information; modal necessity; atomic relations; non-anthropocentric observation; Inducing Effects; phenomenic elements; Vidamor Cabannas; Denivaldo Silva; Hucul; quantum information.This article develops an expanded critical-propositional analysis of D. Hucul, I. V. Inlek, G. Vittorini, C. Crocker, S. Debnath, S. M. Clark, and C. Monroe’s experiment, “Modular Entanglement of Atomic Qubits Using Photons and Phonons,” published in Nature Physics 11, 37–42, in systematic dialogue with the Theory of Objectivity (TO) formulated by Vidamor Cabannas and Denivaldo Silva. Hucul et al. demonstrated a modular quantum architecture in which three trapped 171Yb+ atomic-ion qubits distributed between two physically separated modules were connected through two complementary mediating systems. Remote entanglement between modules was generated probabilistically through spontaneously emitted photons, optical interference, Bell-state-sensitive coincidence detection, and heralding, whereas deterministic entanglement between ions within the same module was established through Coulomb-coupled phonon modes. The experiment achieved an average remote Bell-state fidelity of Fremote = 0.78 ± 0.03, a remote entanglement generation rate of approximately R = 4.5 s−1 , a coherence time of approximately τ = 1.12 s, and intramodular entanglement fidelity of approximately Flocal = 0.85 ± 0.01. It further integrated photonic and phononic buses to produce experimentally observable three-particle correlations. The analysis examines possible correspondences between these results and the seven Absolute Truths of TO, while maintaining a rigorous distinction among modal necessity, empirical compatibility, indirect corroboration, and theoretical identity. Par- ticular attention is given to VA2, concerning the individualized field associated with each element; VA4, concerning boundary and interface; VA5, according to which an element must be observed or situated within the frequency relation of at least two other elements for logical existence; VA6, concerning composition; and VA7, associated in the contemporary formulation of TO with transcendent knowledge or information generated in atomic relations and considered equivalent to atomic radiations. The Hucul experiment is especially significant for the latter proposition because spontaneously emitted radiation physically carries quantum correlations dependent on atomic states and can mediate the constitution of new atom-atom relations across spatially separated modules. The article also analyzes possible relations with TO’s phenomenic elements, Inducing Effects, cosmogonic theorem, and cosmological Eras. It argues that Hucul et al. provide substantial empirical material for constructing operational bridges concerning radiation-information, relational composition, fields, frequencies, interfaces, and non-anthropocentric physical observation. Nevertheless, the experiment does not establish the modal necessity of TO’s axioms, does not empirically demonstrate logical Nothingness, and does not directly verify its cosmogenesis or cosmological Eras. Its strongest contribution to TO is therefore not a confirmation of the theory as a whole but the empirical realization of a class of physical processes that can be translated into explicit and measurable bridge propositions. On this basis, the article assigns Hucul et al. a dialogue score of 8.0/10 relative to TO. Keywords: Theory of Objectivity; modular quantum computing; quantum entangle- ment; atomic qubits; photons; phonons; radiation-information; modal necessity; atomic relations; non-anthropocentric observation; Inducing Effects; phenomenic elements; Vidamor Cabannas; Denivaldo Silva; Hucul; quantum information.

Sep 13, 20260 citations

Entanglement dynamics of qubits in a common environment

Jun‐Hong An, Shun-Jin Wang, Hong‐Gang Luo

arXiv:quant-ph/0604020Physica A Statistical Mechanics and its ApplicationsApr 20, 200731 citations

Single-atom-based asynchronous photonic interconnect for scalable modular quantum computing

Jérémy Raskop, Nadav Kandel, Geva Arwas +6 more

Scaling quantum computation beyond the capacity of a single quantum processing unit requires quantum interconnects between modular processors. Optical photons are natural carriers for distributing entanglement between these processors. Most loss-resilient protocols use photonic Bell-state measurements based on the linear-optics type-II fusion gate. The resulting entanglement rate scales quadratically with each processor's typically low photon-delivery probability. Here we analyze a memory-assisted quantum interconnect using a near-deterministic, robust photon--atom controlled- $Z$ gate via a single atom trapped in a high-finesse cavity. Detecting and measuring a photon from one processor heralds entanglement between that processor and the atom. This entanglement is preserved while the process repeats with the second processor until the second photon is detected and measured. Reading out the atomic qubit finalizes the entanglement between the processors. As the entanglement is mediated by the atom, the photons from both processors do not need to be indistinguishable, removing a major source of infidelity. Furthermore, by removing the simultaneous photon-arrival requirement, the protocol allows the entanglement rate to scale linearly rather than quadratically with photon-arrival probability over a wide parameter range. We derive entanglement rates under realistic parameters, accounting for decay of the atom's entanglement with the first processor and for decoherence caused by unheralded photon interactions. The nanosecond-scale of the gate and read-out operations leads to orders-of-magnitude entanglement-rate gain over linear optics, removing a key bottleneck in modular quantum computing.Scaling quantum computation beyond the capacity of a single quantum processing unit requires quantum interconnects between modular processors. Optical photons are natural carriers for distributing entanglement between these processors. Most loss-resilient protocols use photonic Bell-state measurements based on the linear-optics type-II fusion gate. The resulting entanglement rate scales quadratically with each processor's typically low photon-delivery probability. Here we analyze a memory-assisted quantum interconnect using a near-deterministic, robust photon--atom controlled-$Z$ gate via a single atom trapped in a high-finesse cavity. Detecting and measuring a photon from one processor heralds entanglement between that processor and the atom. This entanglement is preserved while the process repeats with the second processor until the second photon is detected and measured. Reading out the atomic qubit finalizes the entanglement between the processors. As the entanglement is mediated by the atom, the photons from both processors do not need to be indistinguishable, removing a major source of infidelity. Furthermore, by removing the simultaneous photon-arrival requirement, the protocol allows the entanglement rate to scale linearly rather than quadratically with photon-arrival probability over a wide parameter range. We derive entanglement rates under realistic parameters, accounting for decay of the atom's entanglement with the first processor and for decoherence caused by unheralded photon interactions. The nanosecond-scale of the gate and read-out operations leads to orders-of-magnitude entanglement-rate gain over linear optics, removing a key bottleneck in modular quantum computing.

quant-pharXiv:2609.21961Sep 21, 20260 citations

Quantum Information Processing with Modular Networks 1 CLAY

Ton Crocker, I. V. Inlek, David Hucul +3 more

can drive strong local interactions via phonons, and remote qubits can be entangled via photons. Transferring quantum information across spatially separated ion trap modules for a scalable quantum network architecture relies on the juxtaposition of both phononic and photonic buses. We report the successful combination of these protocols within and between two ion trap modules on a unit structure of this architecture where the remote entanglement generation rate exceeds the experimentally measured decoherence rate. Additionally, we report an experimental implementation of a technique to maintain phase coherence between spatially and temporally distributed quantum gate operations, a crucial prerequisite for scalability. Finally, we discuss our progress towards addressing the issue of uncontrolled cross-talk between photonic qubits and memory qubits by implementing a second ion species,can drive strong local interactions via phonons, and remote qubits can be entangled via photons. Transferring quantum information across spatially separated ion trap modules for a scalable quantum network architecture relies on the juxtaposition of both phononic and photonic buses. We report the successful combination of these protocols within and between two ion trap modules on a unit structure of this architecture where the remote entanglement generation rate exceeds the experimentally measured decoherence rate. Additionally, we report an experimental implementation of a technique to maintain phase coherence between spatially and temporally distributed quantum gate operations, a crucial prerequisite for scalability. Finally, we discuss our progress towards addressing the issue of uncontrolled cross-talk between photonic qubits and memory qubits by implementing a second ion species,

Jan 1, 20150 citations

Z

gate via a single atom trapped in a high-finesse cavity. Detecting and measuring a photon from one processor heralds entanglement between that processor and the atom. This entanglement is preserved while the process repeats with the second processor until the second photon is detected and measured. Reading out the atomic qubit finalizes the entanglement between the processors. As the entanglement is mediated by the atom, the photons from both processors do not need to be indistinguishable, removing a major source of infidelity. Furthermore, by removing the simultaneous photon-arrival requirement, the protocol allows the entanglement rate to scale linearly rather than quadratically with photon-arrival probability over a wide parameter range. We derive entanglement rates under realistic parameters, accounting for decay of the atom's entanglement with the first processor and for decoherence caused by unheralded photon interactions. The nanosecond-scale of the gate and read-out operations leads to orders-of-magnitude entanglement-rate gain over linear optics, removing a key bottleneck in modular quantum computing.