Quantum-enabled communication without a phase reference

• URL: http://arxiv.org/abs/2010.11974v2
• Date: Tue, 15 Dec 2020 03:13:34 GMT
• Title: Quantum-enabled communication without a phase reference
• Authors: Quntao Zhuang
• Abstract summary: A phase reference has been a standard requirement in continuous-variable quantum sensing and communication protocols. We show that quantum communication and entanglement-assisted communication without a phase reference are possible, when a short-time memory effect is present.
• Score: 1.14219428942199
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A phase reference has been a standard requirement in continuous-variable quantum sensing and communication protocols. However, maintaining a phase reference is challenging due to environmental fluctuations, preventing quantum phenomena such as entanglement and coherence from being utilized in many scenarios. We show that quantum communication and entanglement-assisted communication without a phase reference are possible, when a short-time memory effect is present. The degradation in the communication rate of classical or quantum information transmission decreases inversely with the correlation time. An exact solution of the quantum capacity and entanglement-assisted classical/quantum capacity for pure dephasing channels is derived, where non-Gaussian multipartite-entangled states show strict advantages over usual Gaussian sources. For thermal-loss dephasing channels, lower bounds of the capacities are derived. The lower bounds also extend to scenarios with fading effect in the channel. In addition, for entanglement-assisted communication, the lower bounds can be achieved by a simple phase-encoding scheme on two-mode squeezed vacuum sources, when the noise is large.

Related papers

• Coherent Information Phase Transition in a Noisy Quantum Circuit [3.134848671499466]
  We introduce quantum-enhanced operations into a noisy monitored quantum circuit. This transition is modulated by the relative frequency of noise and quantum-enhanced operations. We propose a resource-efficient protocol to characterize this phase transition.
  arXiv  Detail & Related papers  (2024-08-29T05:09:35Z)
• Bidirectional classical communication cost of a bipartite quantum channel assisted by non-signalling correlations [6.1108095842541]
  This paper investigates the bidirectional classical communication cost of simulating a bipartite quantum channel assisted by non-signalling correlations. We derive semidefinite programming (SDP) formulations for the one-shot exact bidirectional classical communication cost via non-signalling bipartite superchannels. Our results elucidate the role of non-locality in quantum communication and pave the way for exploring quantum reverse Shannon theory in bipartite scenarios.
  arXiv  Detail & Related papers  (2024-08-05T14:30:50Z)
• Time correlations in atmospheric quantum channels [0.0]
  Efficient transfer of quantum information between remote parties is a crucial challenge for quantum communication over atmospheric channels. Random fluctuations of the channel transmittance are a major disturbing factor for its practical implementation. We study correlations between channel transmittances at different moments of time and focus on two transmission protocols.
  arXiv  Detail & Related papers  (2023-11-13T20:25:36Z)
• Optical fibres with memory effects and their quantum communication capacities [8.999666725996976]
  We show that reliable quantum communication is attainable even for highly noisy regimes. We find the critical time interval between subsequent signals below which quantum communication, two-way entanglement distribution, and quantum key distribution become achievable.
  arXiv  Detail & Related papers  (2023-09-29T08:58:03Z)
• 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)
• Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter [62.997667081978825]
  We introduce a low-overhead protocol to reverse this degradation. We present two trapped-ion schemes for the implementation of a non-unitary probabilistic filter against amplitude damping noise. This filter can be understood as a protocol for single-copy quasi-distillation.
  arXiv  Detail & Related papers  (2022-09-06T18:18:41Z)
• Multipartite entanglement to boost superadditivity of coherent information in quantum communication lines with polarization dependent losses [0.0]
  We show that in the limit of the infinite number of channel uses the superadditivity phenomenon takes place whenever the channel is neither degradable nor antidegradable. We also provide a method how to modify the proposed states and get a higher quantum communication rate by doubling the number of channel uses.
  arXiv  Detail & Related papers  (2021-09-08T12:24:44Z)
• 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)
• Universal non-adiabatic control of small-gap superconducting qubits [47.187609203210705]
  We introduce a superconducting composite qubit formed from two capacitively coupled transmon qubits. We control this low-frequency CQB using solely baseband pulses, non-adiabatic transitions, and coherent Landau-Zener interference. This work demonstrates that universal non-adiabatic control of low-frequency qubits is feasible using solely baseband pulses.
  arXiv  Detail & Related papers  (2020-03-29T22:48:34Z)
• Quantum emulation of coherent backscattering in a system of superconducting qubits [45.82374977939355]
  We use multi-pass Landau-Zener transitions at the avoided crossing of a highly-coherent superconducting qubit to emulate weak localization (WL) and universal conductance fluctuations (UCF) The higher coherence of this qubit enabled the realization of both effects, in contrast to earlier work arXiv:1204.6428, which successfully emulated UCF, but did not observe WL.
  arXiv  Detail & Related papers  (2019-12-28T17:11:53Z)

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.