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Continuous-variable quantum computing in optical time-frequency modes using quantum memories.

Peter C Humphreys1, W Steven Kolthammer1, Joshua Nunn1

  • 1Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.

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Summary
This summary is machine-generated.

We present a compact quantum computing scheme using time-frequency encoded continuous-variable cluster states and quantum memories. This approach enables scalable photonic quantum information processing with fewer quantum memories.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Optics

Background:

  • Continuous-variable (CV) cluster states are crucial for one-way quantum computing.
  • Scalable generation and manipulation of CV cluster states remain a challenge in photonic quantum information processing.
  • Quantum memories are essential for storing and processing quantum information.

Purpose of the Study:

  • To develop a novel scheme for time-frequency encoded CV cluster-state quantum computing.
  • To demonstrate the production, manipulation, and measurement of 2D cluster states in a single spatial mode.
  • To show the potential of quantum memories for scalable photonic quantum computing architectures.

Main Methods:

  • Utilizing time-frequency encoding for quantum information.
  • Exploiting the time-frequency selectivity of Raman quantum memories.
  • Implementing a scheme within a single spatial mode.

Main Results:

  • A compact scheme for generating and manipulating 2D cluster states is proposed.
  • The number of quantum memories required scales linearly with the number of encoded frequencies, independent of temporal duration.
  • Demonstrated feasibility of producing, manipulating, and measuring cluster states.

Conclusions:

  • Quantum memories are a powerful component for scalable photonic quantum information processing.
  • Time-frequency encoding offers a compact and efficient approach to quantum computing.
  • The proposed scheme advances the development of practical quantum computers.