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Configurable unitary transformations and linear logic gates using quantum memories.

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  • 1Centre for Quantum Computation and Communication Technology, Department of Quantum Science, The Australian National University, Canberra, ACT 0200, Australia.

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Summary
This summary is machine-generated.

Quantum memories can form configurable linear optical networks for quantum information processing. This protocol, using off-resonant Raman transitions, enables scalable N-mode unitary operations and demonstrates a conditional CZ gate.

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Atomic physics

Background:

  • Quantum memories are crucial for storing quantum information.
  • Configurable optical networks are essential for quantum computation.
  • Off-resonant Raman transitions enable quantum state storage in atomic spins.

Purpose of the Study:

  • To demonstrate that quantum memories can function as a configurable linear optical network.
  • To show the protocol's applicability to various quantum memory types.
  • To highlight the scalability and versatility of the proposed protocol.

Main Methods:

  • Utilizing off-resonant Raman transitions for storing optical information in atomic spins.
  • Configuring a set of quantum memories to act as a linear optical network.
  • Implementing arbitrary N-mode unitary operations during storage and readout.
  • Demonstrating a conditional CZ gate using cascaded memories.

Main Results:

  • A configurable linear optical network operating on frequency-multiplexed optical states was realized.
  • The protocol supports arbitrary N-mode unitary operations with favorable scaling.
  • The versatility was shown by implementing a conditional CZ gate.

Conclusions:

  • Quantum memories can be configured into versatile linear optical networks.
  • The protocol offers a scalable approach for quantum information processing.
  • This work advances the development of quantum computing architectures.