Tunable M-Ary Quantum Secure Direct Communication via Correlation-Histogram Modulation

• URL: http://arxiv.org/abs/2607.02858v1
• Date: Fri, 03 Jul 2026 01:42:57 GMT
• Title: Tunable M-Ary Quantum Secure Direct Communication via Correlation-Histogram Modulation
• Abstract summary: We propose a two-way entanglement-based quantum secure direct communication protocol.<n>The protocol uses a fixed two-qubit polarization Hilbert space and only standard coincidence-based polarization measurement at the receiver.<n>The protocol introduces protocol-level design parameters not available in fixed-alphabet two-way QSDC.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a two-way entanglement-based quantum secure direct communication (QSDC) protocol in which information is encoded as the value of a continuously tunable parameter and decoded from empirically estimated joint-outcome histograms over windows of detected pairs. The protocol uses a fixed two-qubit polarization Hilbert space and only standard coincidence-based polarization measurement at the receiver, with the symbol alphabet enlarged not by increasing the carrier Hilbert-space dimension but by exploiting temporal integration over a window of pairs to resolve distinguishable joint-outcome probability distributions. Under an idealized model in which the source is maximally entangled, the encoding operation is strictly local, and the channel imprints no parameter-dependent signature on the traveling photon, the reduced state of the traveling photon is maximally mixed and independent of the encoded parameter. Consequently, passive interception of the in-flight subsystem alone yields no information about the encoded message. We further develop a quantitative trace-distance framework for bounding any parameter-dependent leakage that may arise from non-ideal channel and device effects in practical implementations. The protocol introduces protocol-level design parameters not available in fixed-alphabet two-way QSDC, specifically a runtime-tunable alphabet size and native support for continuous-time analog modulation, which may be advantageous in operating environments where channel conditions vary on protocol-relevant timescales.

Related papers

• Quantum Remote Implementation of Hybrid Operations on Hyperstates Using Hyperentangled States [4.6612979288302006]
  Quantum remote control, also known as quantum remote implementation of an operator (QRIO), enables the remote manipulation of an arbitrary quantum state.<n>We propose a QRIO protocol that simultaneously utilizes the polarization and spatial DOFs of a two-qubit hyperentangled state.<n>The proposed scheme is a promising candidate for hybrid quantum communication and distributed quantum information processing.
  arXiv  Detail & Related papers  (2026-07-16T10:38:50Z)
• Free-Space CV-QKD with Single-Mode Fiber Reception: Effective Coupling Statistics and Protocol-Dependent Reference Noise [0.0]
  We study continuous-variable quantum key distribution with single-mode fiber reception under atmospheric turbulence.<n>We first examine the standard GG02 setting and ask which receiver-side observable is sufficient for effective key-rate prediction.<n>We show that a mean-loss description is generally too optimistic, whereas a scalar effective law for the SMF coupling efficiency provides an accurate downstream Gaussian-channel description.
  arXiv  Detail & Related papers  (2026-06-23T11:07:32Z)
• Fault-tolerant measurement-device-independent quantum key distribution with noisy non-Gaussian error correction [0.0]
  We propose an enhanced scheme for the asymmetric CV-MDI-QKD protocol by using Gottesman-Kitaev-Preskill (GKP)<n>In particular, the proposed scheme, which correlates the noises of the data and ancilla via a pair of symplectic transforms, extracts the error syndromes from stabilizer measurements.<n> Numerical analysis shows the composable finite-size security of the protocol under the collective Gaussian attack.
  arXiv  Detail & Related papers  (2026-05-05T02:27:11Z)
• Software-enhanced simultaneous quantum-classical communication protocol with Gaussian post-selection [0.6299766708197883]
  We introduce Gaussian post-selection into the SQCC framework, enabling a software-based optimisation of the modulation variance after channel estimation.<n>We show that our protocol significantly improves the transmission distance and robustness of SQCC across both fibre and free-space channels.<n>Results highlight the practicality of post-selection based SQCC for real-world quantum communication over both terrestrial fiber networks and satellite-based free-space links.
  arXiv  Detail & Related papers  (2025-10-15T04:35:18Z)
• Unsupervised Conformal Inference: Bootstrapping and Alignment to Control LLM Uncertainty [49.19257648205146]
  We propose an unsupervised conformal inference framework for generation.<n>Our gates achieve close-to-nominal coverage and provide tighter, more stable thresholds than split UCP.<n>The result is a label-free, API-compatible gate for test-time filtering.
  arXiv  Detail & Related papers  (2025-09-26T23:40:47Z)
• Joint Transmit and Pinching Beamforming for Pinching Antenna Systems (PASS): Optimization-Based or Learning-Based? [89.05848771674773]
  A novel antenna system ()-enabled downlink multi-user multiple-input single-output (MISO) framework is proposed.<n>It consists of multiple waveguides, which equip numerous low-cost antennas, named (PAs)<n>The positions of PAs can be reconfigured to both spanning large-scale path and space.
  arXiv  Detail & Related papers  (2025-02-12T18:54:10Z)
• Practical quantum secure direct communication with squeezed states [37.69303106863453]
  We report the first table-top experimental demonstration of a CV-QSDC system and assess its security.<n>This realization paves the way into future threat-less quantum metropolitan networks, compatible with coexisting advanced wavelength division multiplexing (WDM) systems.
  arXiv  Detail & Related papers  (2023-06-25T19:23:42Z)
• Single-photon-memory measurement-device-independent quantum secure direct communication [63.75763893884079]
  Quantum secure direct communication (QSDC) uses the quantum channel to transmit information reliably and securely. In order to eliminate the security loopholes resulting from practical detectors, the measurement-device-independent (MDI) QSDC protocol has been proposed. We propose a single-photon-memory MDI QSDC protocol (SPMQC) for dispensing with high-performance quantum memory.
  arXiv  Detail & Related papers  (2022-12-12T02:23:57Z)
• Deep Reinforcement Learning for IRS Phase Shift Design in Spatiotemporally Correlated Environments [93.30657979626858]
  We propose a deep actor-critic algorithm that accounts for channel correlations and destination motion. We show that, when channels aretemporally correlated, the inclusion of the SNR in the state representation with function approximation in ways that inhibit convergence.
  arXiv  Detail & Related papers  (2022-11-02T22:07:36Z)
• Data post-processing for the one-way heterodyne protocol under composable finite-size security [62.997667081978825]
  We study the performance of a practical continuous-variable (CV) quantum key distribution protocol. We focus on the Gaussian-modulated coherent-state protocol with heterodyne detection in a high signal-to-noise ratio regime. This allows us to study the performance for practical implementations of the protocol and optimize the parameters connected to the steps above.
  arXiv  Detail & Related papers  (2022-05-20T12:37:09Z)
• Reference-frame-independent design of phase-matching quantum key distribution [0.1529342790344802]
  We propose a reference-frame-independent design of phase-matching quantum key distribution by introducing high-dimensional key encoding space. We present a security proof of this high-dimensional phase-matching quantum key distribution and demonstrate with simulation that a 17-dimensional protocol is completely immune to any degree of fixed misalignment and robust to slow phase fluctuations.
  arXiv  Detail & Related papers  (2021-09-15T12:22:16Z)
• Composably secure data processing for Gaussian-modulated continuous variable quantum key distribution [58.720142291102135]
  Continuous-variable quantum key distribution (QKD) employs the quadratures of a bosonic mode to establish a secret key between two remote parties. We consider a protocol with homodyne detection in the general setting of composable finite-size security. In particular, we analyze the high signal-to-noise regime which requires the use of high-rate (non-binary) low-density parity check codes.
  arXiv  Detail & Related papers  (2021-03-30T18:02:55Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.