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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quantum-Enabled Communication without a Phase Reference.

Quntao Zhuang1

  • 1Department of Electrical and Computer Engineering and James C. Wyant College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA.

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Summary
This summary is machine-generated.

Quantum communication and entanglement-assisted communication are possible without a phase reference, utilizing short-time memory effects. This research advances quantum information science by overcoming environmental challenges in quantum sensing and communication.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Protocols
  • Quantum Sensing

Background:

  • Maintaining a phase reference is crucial for continuous-variable quantum protocols.
  • Environmental fluctuations pose significant challenges to phase reference stability.
  • These challenges limit the application of quantum phenomena like entanglement and coherence.

Purpose of the Study:

  • To demonstrate the feasibility of quantum and entanglement-assisted communication without a phase reference.
  • To investigate the role of short-time memory effects in enabling such communication.
  • To derive and analyze quantum capacities for dephasing channels.

Main Methods:

  • Theoretical derivation of exact solutions for quantum and entanglement-assisted capacities in pure dephasing channels.
  • Analysis of communication rate degradation inversely proportional to correlation time.
  • Derivation of lower bounds for capacities in thermal-loss dephasing channels and fading scenarios.

Main Results:

  • Quantum communication and entanglement-assisted communication are achievable without a phase reference when short-time memory effects are present.
  • Non-Gaussian multipartite-entangled states offer advantages over Gaussian sources for pure dephasing channels.
  • Lower bounds for capacities in thermal-loss dephasing channels were derived and shown to extend to fading channels.

Conclusions:

  • Short-time memory effects enable robust quantum communication strategies independent of a stable phase reference.
  • The findings highlight the potential of non-Gaussian states in advancing quantum communication capabilities.
  • Practical entanglement-assisted communication schemes using two-mode squeezed vacuum sources were identified for high-noise conditions.