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Quantum memory receiver for superadditive communication using binary coherent states.

Aleksandra Klimek1, Michał Jachura1, Wojciech Wasilewski1

  • 1Wydział Fizyki, Uniwersytet Warszawski , Warszawa , Poland .

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Summary
This summary is machine-generated.

This study introduces a quantum memory architecture for enhanced classical communication rates. It demonstrates the superadditivity effect, boosting transmission speeds through joint detection in quantum channels.

Keywords:
Quantum memoryoptical communicationquantum measurement

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Area of Science:

  • Quantum Information Science
  • Classical Communication Systems
  • Optical Physics

Background:

  • Classical information transmission over quantum channels faces limitations.
  • Quantum channels offer potential for enhanced communication rates through novel techniques.
  • Superadditivity in classical communication over quantum channels is an area of active research.

Purpose of the Study:

  • To propose a simple architecture for collective readout of classical information using multimode quantum memories.
  • To demonstrate the superadditivity effect in classical communication over quantum channels.
  • To analyze readout schemes based on direct detection and Dolinar receivers.

Main Methods:

  • Utilizing multimode quantum memories for collective readout.
  • Employing pair coherent states for classical information keying, specifically binary phase shift keying (BPSK).
  • Mapping Hadamard sequences of input symbols to pulse position modulation (PPM) via linear optical transformation.
  • Analyzing direct detection and Dolinar receiver strategies for readout.

Main Results:

  • The proposed architecture enables the demonstration of the superadditivity effect.
  • Joint detection applied to multiple channel uses enhances the classical information transmission rate.
  • Analysis covers two readout methods, including an optimal minimum-error measurement strategy.

Conclusions:

  • The proposed quantum memory architecture offers a viable method for enhancing classical communication rates over quantum channels.
  • The superadditivity effect can be practically demonstrated and leveraged for improved transmission efficiency.
  • The integration of Hadamard sequences and PPM, coupled with advanced readout, shows promise for future quantum communication systems.