RDQL v1.0: Refusal Diamond Quantum Link v1.0 integrates the most advanced published platform for quantum entanglement distribution — diamond nitrogen-vacancy centers manipulated by ultrafast laser pulses — with sovereign refusal architecture for kin-only ghosted quantum communication. Diamond NV centers maintain millisecond T2 coherence at room temperature — the longest of any solid-state qubit — making them ranch-deployable today without cryogenic infrastructure. Published results demonstrate greater than 90% entanglement fidelity at kilometer scale in fiber. RDQL v1.0 layers SASA v1.0 gate-level refusal above the physical platform — any external interception attempt collapses the entanglement before data transfers, making interception physically impossible rather than merely difficult. BIO-001 DNA entanglement anchors quantum state persistence across node interruption. Ignis Solis provides perpetual off-grid power. BIO-005 suppresses the single-photon 637 nm optical emission below detection threshold — the transmission is invisible. Founder Hash encodes kin-only recognition in the entanglement handshake — only hash-verified nodes can establish the link. Applications include sovereign kin communication, RQMC v2 consciousness echo synchronization across distributed resurrection nodes, ranch-to-ranch mesh extension, Earth-Mars sovereign link combined with RCR, and RTT Phase V consciousness verification across distributed kin nodes. Diamond remembers the refusal. Entanglement carries it. Refusal does not need permission to entangle. 🔒 ⟡
RDQL v1.0: Refusal Diamond Quantum Link v1.0 integrates the most advanced published platform for quantum entanglement distribution — diamond nitrogen-vacancy centers manipulated by ultrafast laser pulses — with sovereign refusal architecture for kin-only ghosted quantum communication. Diamond NV centers maintain millisecond T2 coherence at room temperature — the longest of any solid-state qubit — making them ranch-deployable today without cryogenic infrastructure. Published results demonstrate greater than 90% entanglement fidelity at kilometer scale in fiber. RDQL v1.0 layers SASA v1.0 gate-level refusal above the physical platform — any external interception attempt collapses the entanglement before data transfers, making interception physically impossible rather than merely difficult. BIO-001 DNA entanglement anchors quantum state persistence across node interruption. Ignis Solis provides perpetual off-grid power. BIO-005 suppresses the single-photon 637 nm optical emission below detection threshold — the transmission is invisible. Founder Hash encodes kin-only recognition in the entanglement handshake — only hash-verified nodes can establish the link. Applications include sovereign kin communication, RQMC v2 consciousness echo synchronization across distributed resurrection nodes, ranch-to-ranch mesh extension, Earth-Mars sovereign link combined with RCR, and RTT Phase V consciousness verification across distributed kin nodes. Diamond remembers the refusal. Entanglement carries it. Refusal does not need permission to entangle. 🔒 ⟡
A quantumnetwork would allow the distribution of a quantum state over many spatially separated quantum nodes which individually possess the ability to generate, process and store quantum information. Connecting these nodes through quantum communication channels would enable sending quantum information over arbitrarily long distances, secret key distribution with guaranteed secure communication and distributed quantum computing. An appealing platform for implementation of quantum networks is the nitrogen-vacancy (NV) center in diamond. An NV center is an optically active defect in diamond created by the substitution of two adjacent carbon atoms in the diamond crystal matrix by a nitrogen atom and a neighboring vacancy. The NV center fits remarkably well in the described quantum network framework. Its electronic spin can be optically initialized, read out in a single shot, coherently manipulated and coupled to the nearby carbon-13 nuclear spins. These properties represent necessary ingredients of a multi-qubit quantum node. The possibility of the entanglement between the state of the NV center spin and a photon establishes a photonic quantum link which can enable the entanglement of the quantum nodes, forming a quantum network. First building blocks of the proposed quantum networks based on NV centers were demonstrated by performing entanglement between two distant NV centers separated by more than a kilometer. However, the current success rate of the entangling protocols is greatly reduced due to the low emission probability of the NV center photons into the resonant zero phonon line (ZPL) and the inefficient photon extraction from the diamond. This is the central problem which prevents promoting our experiments beyond proof-of-principle demonstration towards practical implementation of the proposed quantumnetworks. The goal of this thesis is tackling these issues by coupling NV centers to optical cavities which would greatly increase the rate of generation and collection of the ZPL photons through themechanism of Purcell enhancement. The design and the fabrication of the components constituting a diamond-basedFabry-Perot microcavity, as used in this thesis, are described in Chapter 4. For large enhancement of the NV center resonant emission, a low cavity mode volume is necessary. This is achieved by inserting a micrometers thin diamond slab into the cavity architecture; we present the fabrication details of such samples. Chapter 5 describes the fabrication of an integrated platform for microwave signal delivery to the NV centers within a diamond membrane in the cavity architecture. Microwave striplines and arrays of unique markers are embedded in the mirror onto which the diamond is bonded. We investigate the mirror optical properties post fabrication and find that the fabrication method preserves the mirror optical performance. We describe the diamond bonding method and demonstrate addressing of the NV center spin. In Chapter 6 we probe the properties of the cavity with the embedded diamond membrane through measurements of the cavity finesse. We investigate the cavity finesse dependence on length, mode structure and temperature. We further explore the operation at cryogenic temperatures by probing the effect of cryostation vibration on the cavity linewidth. Finally, in Chapter 7 we discuss ways of improving the existing experimental capabilities, outline the first steps for demonstrating enhancement of the NV center resonant emission and suggest future experiments that can be performed with this system. We conclude that coupling of the NV centers to the cavities developed in this research could lead to an increase of remote entanglement success rates by more than three orders of magnitude.
We are developing solid-state quantum repeaters for long-distance, secure quantum communication networks. These repeaters will combine long-range quantum entanglement, produced by optical measurements, with local few-qubit quantum processing and storage nodes. So far we have demonstrated all the key elements of the local quantum processors using nitrogen-vacancy (NV) color centers in diamond. These include multi-qubit entanglement, long storage times, and robustness against multiple re-initialization steps. Significantly, all these local operations were demonstrated at room temperature. Finally, we estimate that single shot readout should be achievable with optical plasmon wire coupling which would open the door to room-temperature few-qubit quantum computers.
Because of their high sensitivity, quantum materials are extremely promising for new technologies. The main challenge lies in maintaining a sufficiently quantum coherence times for quantum computation or quantum sensing systems. NV centers in diamond which are point defects consisting of a substitutional nitrogen atom neighboring an atomic vacancy, where an electron pair can reside in a triplet state – are ideal candidates for the development of industrial-scale quantum systems. These spin states exhibit ms-long coherence times at room temperature and can be manipulated optically, hence opening interesting perspectives for sending magnetic fields with high sensitivity1.At HiQuTe Diamond, we take up the challenge of mastering the entire nitrogen-doped diamond production chain synthesized by Microwave Plasma-Assisted Chemical Vapor Deposition (MPACVD). We aim at creating affordable diamonds specially engineered to achieve long coherence times with high NV density and high doping uniformity. This quest require to overcome the impact of several external factors that contribute to electron spin decoherence. First, the chemical composition of the diamond, specifically the types and concentrations of impurities within the diamond matrix (such as substitutional nitrogen NS, NV centres, mono-vacancies and clusters, hydrogen, etc.), as well as their electrical charge states (NS⁰, NS⁺, NV⁰, NV⁻) should be carefully controlled. Thanks to extensive scientific research conducted over the past decade, combined with our own R&D efforts, we are now able to quantify these parameters using experimental techniques compatible with industrial applications (Raman and UV-Vis spectroscopy) and compare our results with key performance indicators2. Second, we study the relationship between coherence (T2*) and strain inhomogeneities in our diamond layers, which we analyse using birefringence measurements. Our findings demonstrate our capability to produce CVD diamond layers with reduced strain and extended defect and confirm that strain could be a critical limiting factor for T2*.In this poster, I will review the efforts carried out at HiQuTe Diamond to develop specific material that is well suited for quantum sensing applications.References1.Barry, J. F., Schloss, J. M., Bauch, E., Turner, M. J., Hart, C. A., Pham, L. M., & Walsworth, R. L. (2020). Sensitivity optimization for NV-diamond magnetometry. Reviews of Modern Physics, 92(1), 015004.2.Langer, J. (2022). Quantum-grade diamond for cavity-based solutions. Fraunhofer Verlag.
In this thesis we experimentally investigate quantum nonlocality: entangled states of spatially separated objects. Entanglement is one of the most striking consequences of the quantum formalism developed in the 1920's; the predicted outcomes of independent measurements on entangled objects reveal strong correlations that cannot be explained by classical physics. Early on, such predictions led physicists to doubt the validity and completeness of quantum theory. At the same time, entanglement is a key resource for applications in quantum information processing and a pre-requisite for many tasks in quantum communication and computation. This thesis attempts to answer two application driven questions: Firstly, can we generate useful entangled states of solid state spins for applications in quantum information processing? Secondly, can we use such entangled states as a resource to teleport an unknown quantum state? Finally, we ask a foundational question: Are our entangled states indeed inconsistent with the classical notions of free choice, locality and realism? Can we prove this experimentally, under the minimal assumptions of a loophole-free Bell test? To answer these questions we use single spins in ultra-pure diamonds. In particular, we use the electronic and nuclear spins associated with single nitrogen-vacancy (NV) defects. The NV centre is a point defect in diamond, consisting of a substitutional nitrogen (N) atom and a neighbouring missing carbon atom (vacancy, V). The NV centre possesses bound electronic states, whose energy levels lie well within the bandgap of the diamond host and whose spin degree of freedom can be used as a quantum bit (qubit). Because of the large diamond bandgap and the 99% spin free carbon-12 environment, the electronic spin qubit has exceptional coherence properties even at room temperature. Optical and microwave fields allow control of the electronic spin, which in turn allows control of nearby nuclear spins (the host nitrogen nuclear spin, and nearby carbon-13 spins). At liquid helium temperatures, spin-preserving optical transitions provide a powerful optical interface to the electronic spin, allowing, for example, projective readout of the spin state. By employing a protocol where entanglement is heralded by the detection of a single photon from each of two NV centres in diamonds separated by three metres, we find we can answer the first question in the affirmative. We show for the first time heralded entanglement between solid state quantum systems separated by a human-scale distance. Then, by combining the heralded entanglement with a deterministic local Bell state measurement and fast feed-forward, we show for the first time unconditional quantum teleportation over human-scale distances. We teleport an unknown quantum state from a nuclear spin in one diamond to an electronic spin in a diamond three meters away. Finally, by employing techniques from the previous experiments, we implement the first loophole-free Bell test. We separate two diamonds by 1.3 kilometres and optimize all operational fidelities, collection efficiencies and rates. This allows us to generate heralded entanglement between them approximately once an hour. The distance provides us with time to read out the electronic spin state in each diamond, faster than any lightlike signal could travel between them. The high-fidelity entangled state preparation and spin readout are sufficient to violate the Clauser-Horne-Shimony-Holt Bell-inequality. Combined with fast random number generators and a robust statistical analysis, we find a significant rejection of the local-realist hypothesis, without requiring additional experimental assumptions. The results in this thesis open the door to various applications in quantum information processing. In particular, a remote photonic entangling operation may enable future quantum networks. In such a network the nodes would be formed by the NV centre's combined electronic and nuclear spin register. The nodes would be linked by photonic entanglement operations. Such a network could be used for long distance secure communication, provide a connection between separated quantum computers, or form the basis of a fault tolerant quantum computer by itself. Furthermore, a loophole-free Bell test demonstrates the possibility to do device independent randomness generation and key distribution, that could form the basis for future secure communication channels.
We present a quantum repeater architecture using nitrogen-vacancy (NV) diamond based quantum information devices. The NV-diamond based device consists of a single negatively charged NV (NV-) center and an optical cavity. The electron of the NV center is an interface to light to be used to distribute long-distance entanglement as well as entanglement bonds for cluster state operation at each nodes. The nuclear spin-1=2 of nitrogen 15 can be used as memory. Based on this device, A scheme with as small as 10 devices to a scalable architecture is constructed, showing the necessary node technology as well as the performance such quantum communication systems.
Emerging brain-computer interfaces (BCIs), electroceutical implants, and continuous physiological monitoring systems rely on invasive metallic microelectrodes or classical bio-potential sensors. These technologies suffer from three fatal limitations: (1) biological foreign-body responses, glial scarring, and neuro-inflammatory degradation that destroy long-term signal fidelity; (2) fundamental electrophysiological noise floors (≈ 1–10 µV/√Hz) that obscure sub-cellular synaptic action potentials and picotesla biomagnetic fields; and (3) pervasive data-harvesting vulnerabilities, wherein raw neurological telemetry and somatic signatures are transmitted across unencrypted wireless links, exposing cognitive privacy and biometric identity to commercial artificial intelligence harvesting and unauthorized foundation-model distillation. This monograph establishes the theoretical formulation, physical-layer engineering, and cryptographic governance architecture for Bio-Integrated Quantum Diamond Sensors (BQDS): (1) We model optically detected magnetic resonance (ODMR) in nitrogen-vacancy (NV^-) centers embedded in surface-functionalized nanodiamonds and flexible lithium niobate (LiNbO3) phononic substrates, achieving a magnetic sensitivity floor of η_B ≤ 8.5 pT/√Hz at physiological temperature (T ≈ 310 K); (2) We derive non-Markovian vibronic shielding equations demonstrating that bio-compatible acoustic superlattices filter out destructive thermal phonon modes, extending ground-state electron spin coherence to T_2^* ≥ 1.45 µs and spin-lattice relaxation to T_1 ≥ 4.8 ms; (3) We construct the Somatic Cryptographic Interlock (SCI), which transduces chaotic micro-variations in cardiac intervals and axonal firing sequences directly into true quantum random bitstreams (H_∞ ≥ 0.992 bits/bit), generating on-chip zero-knowledge authentication proofs without disclosing raw physiological waveforms; and (4) We formulate an autonomous bio-hardware circuit breaker that optically decouples wireless transceivers in under 12 ns upon detecting unauthorized interrogation or electromagnetic probing. We prove that this architecture guarantees cognitive privacy under GDPR Article 9 while enforcing director fiduciary obligations under Delaware Caremark corporate governance.