Reinforcement-learning calibration of coherent-state receivers on variable-loss optical channels

• URL: http://arxiv.org/abs/2203.09807v1
• Date: Fri, 18 Mar 2022 09:12:19 GMT
• Title: Reinforcement-learning calibration of coherent-state receivers on variable-loss optical channels
• Authors: Matias Bilkis, Matteo Rosati, John Calsamiglia
• Abstract summary: We study the problem of calibrating a quantum receiver for optical coherent states when transmitted on a quantum optical channel with variable transmissivity. We optimize the error probability of legacy adaptive receivers, such as Kennedy's and Dolinar's, on average with respect to the channel transmissivity distribution.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the problem of calibrating a quantum receiver for optical coherent states when transmitted on a quantum optical channel with variable transmissivity, a common model for long-distance optical-fiber and free/deep-space optical communication. We optimize the error probability of legacy adaptive receivers, such as Kennedy's and Dolinar's, on average with respect to the channel transmissivity distribution. We then compare our results with the ultimate error probability attainable by a general quantum device, computing the Helstrom bound for mixtures of coherent-state hypotheses, for the first time to our knowledge, and with homodyne measurements. With these tools, we first analyze the simplest case of two different transmissivity values; we find that the strategies adopted by adaptive receivers exhibit strikingly new features as the difference between the two transmissivities increases. Finally, we employ a recently introduced library of shallow reinforcement learning methods, demonstrating that an intelligent agent can learn the optimal receiver setup from scratch by training on repeated communication episodes on the channel with variable transmissivity and receiving rewards if the coherent-state message is correctly identified.

Related papers

• Joint Communication and Sensing over the Lossy Bosonic Quantum Channel [1.534667887016089]
  We study the problem of joint communication and sensing for data transmission systems. We use optimal quantum instruments in order to transmit data and, at the same time, estimate environmental parameters.
  arXiv  Detail & Related papers  (2024-11-18T14:26:17Z)
• Quantum channel correction outperforming direct transmission [0.0]
  Long-distance optical quantum channels are necessarily lossy. Quantum states carrying information in the channel can be probabilistically amplified to compensate for loss, but are destroyed when amplification fails. We perform distillation by heralded amplification to improve a noisy entanglement channel. We employ entanglement swapping to demonstrate that arbitrary quantum information transmission is unconditionally improved.
  arXiv  Detail & Related papers  (2024-06-07T06:09:26Z)
• Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory [47.00474212574662]
  A superconducting qubit is coupled to a large-bandwidth readout resonator. We show a beyond-state-of-the-art two-state-readout error of only 0.25,%$ in 100 ns integration time. The presented results are expected to further boost the performance of new and existing algorithms and protocols.
  arXiv  Detail & Related papers  (2023-07-15T10:30:10Z)
• Fault-tolerant Coding for Entanglement-Assisted Communication [46.0607942851373]
  This paper studies the study of fault-tolerant channel coding for quantum channels. We use techniques from fault-tolerant quantum computing to establish coding theorems for sending classical and quantum information in this scenario. We extend these methods to the case of entanglement-assisted communication, in particular proving that the fault-tolerant capacity approaches the usual capacity when the gate error approaches zero.
  arXiv  Detail & Related papers  (2022-10-06T14:09:16Z)
• 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)
• Blind Equalization and Channel Estimation in Coherent Optical Communications Using Variational Autoencoders [1.7188280334580193]
  We investigate the potential of adaptive blind equalizers based on variational inference for carrier recovery in optical communications. We generalize the concept of variational autoencoder (VAE) equalizers to higher order modulation formats.
  arXiv  Detail & Related papers  (2022-04-25T16:46:03Z)
• Efficient and robust certification of genuine multipartite entanglement in noisy quantum error correction circuits [58.720142291102135]
  We introduce a conditional witnessing technique to certify genuine multipartite entanglement (GME) We prove that the detection of entanglement in a linear number of bipartitions by a number of measurements scales linearly, suffices to certify GME. We apply our method to the noisy readout of stabilizer operators of the distance-three topological color code and its flag-based fault-tolerant version.
  arXiv  Detail & Related papers  (2020-10-06T18:00:07Z)
• 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)
• Explicit construction of optimal witnesses for input-output correlations attainable by quantum channels [3.441021278275805]
  We consider the problem of characterizing the set of classical noisy channels that can be obtained from a quantum channel. We consider various classes of linear witnesses and compute their optimum values in closed form for several classes of quantum channels. The witnesses that we consider here are formulated as communication games, in which Alice's aim is to exploit a single use of a given quantum channel to help Bob guess some information she has received from an external referee.
  arXiv  Detail & Related papers  (2020-09-02T07:34:23Z)
• Optimally Displaced Threshold Detection for Discriminating Binary Coherent States Using Imperfect Devices [50.09039506170243]
  We analytically study the performance of the generalized Kennedy receiver having optimally displaced threshold detection (ODTD) in a realistic situation with noises and imperfect devices. We show that the proposed greedy search algorithm can obtain a lower and smoother error probability than the existing works.
  arXiv  Detail & Related papers  (2020-07-21T21:52:29Z)
• Millimeter Wave Communications with an Intelligent Reflector: Performance Optimization and Distributional Reinforcement Learning [119.97450366894718]
  A novel framework is proposed to optimize the downlink multi-user communication of a millimeter wave base station. A channel estimation approach is developed to measure the channel state information (CSI) in real-time. A distributional reinforcement learning (DRL) approach is proposed to learn the optimal IR reflection and maximize the expectation of downlink capacity.
  arXiv  Detail & Related papers  (2020-02-24T22:18:54Z)

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.