Fundamental Quality Bound on Optical Quantum Communication

• URL: http://arxiv.org/abs/2510.07121v1
• Date: Wed, 08 Oct 2025 15:12:37 GMT
• Title: Fundamental Quality Bound on Optical Quantum Communication
• Authors: Tobias Rippchen, Ludovico Lami, Gerardo Adesso, Mario Berta,
• Abstract summary: We prove that entanglement's entropy sharpens the rate of distillation under non-entangling operations.<n>These findings offer a new perspective on entanglement as a resource for future quantum optical networks.
• Score: 16.94403919812334
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Sending quantum information reliably over long distances is a central challenge in quantum technology in general, and in quantum optics in particular, since most quantum communication relies on optical fibres or free-space links. Here, we address this problem by shifting the focus from the quantity of information sent to the quality of the transmission, i.e. the rate of decay of the transmission error with respect to the number of channel uses. For the general class of teleportation-simulable channels, which includes all channels arising in quantum optical communication, we prove that the single-letter reverse relative entropy of entanglement of the Choi state upper bounds the error exponent of two-way assisted quantum communication - paralleling the celebrated capacity bound of [Pirandola et al., Nat. Comm. (2017)] in terms of the regularised relative entropy of entanglement. Remarkably, for Gaussian channels our bound can be computed efficiently through a convex program with simple constraints involving only finite-dimensional covariance matrices. As a prototypical application, we derive closed-form analytical expressions for several one-mode Gaussian channels that are fundamental to optical communication. Extending recent work [Lami et al., arXiv:2408.07067 (2024)] to infinite-dimensional systems, we further endow the reverse relative entropy of entanglement with an exact operational interpretation in entanglement testing, and show that it characterises the rate of entanglement distillation under non-entangling operations. These findings offer a new perspective on entanglement as a resource and sharpen the theoretical benchmarks for future quantum optical networks.

Related papers

• Quantum-Channel Matrix Optimization for Holevo Bound Enhancement [87.57725685513088]
  We propose a unified projected gradient ascent algorithm to optimize the quantum channel given a fixed input ensemble.<n> Simulation results demonstrate that the proposed quantum channel optimization yields higher Holevo bounds than input ensemble optimization.
  arXiv  Detail & Related papers  (2026-02-19T04:15:03Z)
• Simultaneous Classical and Quantum Communications: Recent Progress and Three Challenges [52.931372025288844]
  We explore novel protocols that enable simultaneous classical and quantum communications.<n>We extend quantum communication capabilities beyond traditional optical bands into the terahertz.<n>We identify open problems that must be addressed to facilitate practical implementation.
  arXiv  Detail & Related papers  (2025-12-11T00:27:08Z)
• The multimode conditional quantum Entropy Power Inequality and the squashed entanglement of the multimode extreme bosonic Gaussian channels [53.253900735220796]
  Inequality determines the minimum conditional von Neumann entropy of the output of the most general linear mixing of bosonic quantum modes.<n>Bosonic quantum systems constitute the mathematical model for the electromagnetic radiation in the quantum regime.
  arXiv  Detail & Related papers  (2024-10-18T13:59:50Z)
• Correlation measures of a quantum state and information characteristics of a quantum channel [0.0]
  We discuss the interconnections between basic correlation measures of a bipartite quantum state and basic information characteristics of a quantum channel. We describe properties of the (unoptimized and optimized) quantum discord in infinite bipartite systems.
  arXiv  Detail & Related papers  (2023-04-11T17:58:13Z)
• Entanglement Distribution and Quantum Teleportation in Higher Dimension over the Superposition of Causal Orders of Quantum Channels [13.359442837017202]
  We develop and formulate the theoretical framework for transmission of classical information through entanglement distribution of qudits over two quantum channels. Results show that entanglement distribution of a qudit provides a considerable gain in fidelity even with increase in noise.
  arXiv  Detail & Related papers  (2023-03-19T15:06:24Z)
• Coexistent quantum channel characterization using spectrally resolved Bayesian quantum process tomography [0.0]
  Coexistence of quantum and classical signals over same optical fiber is critical for operating quantum networks. We systematically characterize the quantum channel that results from simultaneously distributing approximate single-photon polarization-encoded qubits.
  arXiv  Detail & Related papers  (2022-08-30T19:57:45Z)
• Exact solution for the quantum and private capacities of bosonic dephasing channels [10.787390511207686]
  We provide the first exact calculation of the quantum, private, two-way assisted quantum, and secret-key capacities of bosonic dephasing channels.
  arXiv  Detail & Related papers  (2022-05-11T19:12:12Z)
• Quantum Semantic Communications for Resource-Efficient Quantum Networking [52.3355619190963]
  This letter proposes a novel quantum semantic communications (QSC) framework exploiting advancements in quantum machine learning and quantum semantic representations. The proposed framework achieves approximately 50-75% reduction in quantum communication resources needed, while achieving a higher quantum semantic fidelity.
  arXiv  Detail & Related papers  (2022-05-05T03:49:19Z)
• Direct Quantum Communications in the Presence of Realistic Noisy Entanglement [69.25543534545538]
  We propose a novel quantum communication scheme relying on realistic noisy pre-shared entanglement. Our performance analysis shows that the proposed scheme offers competitive QBER, yield, and goodput.
  arXiv  Detail & Related papers  (2020-12-22T13:06:12Z)
• Fault-tolerant Coding for Quantum Communication [71.206200318454]
  encode and decode circuits to reliably send messages over many uses of a noisy channel. For every quantum channel $T$ and every $eps>0$ there exists a threshold $p(epsilon,T)$ for the gate error probability below which rates larger than $C-epsilon$ are fault-tolerantly achievable. Our results are relevant in communication over large distances, and also on-chip, where distant parts of a quantum computer might need to communicate under higher levels of noise.
  arXiv  Detail & Related papers  (2020-09-15T15:10:50Z)

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.