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Related Experiment Videos

Interconvertibility of single-rail optical qubits.

Dominic W Berry1, A I Lvovsky, Barry C Sanders

  • 1Department of Physics, The University of Queensland, Queensland 4072, Australia.

Optics Letters
|January 20, 2006
PubMed
Summary
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We demonstrate a method to convert quantum states of light using linear optics and homodyne measurements. This technique optimizes generalized quantum efficiency for single-photon states, proving its effectiveness and optimality.

Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Partially coherent superpositions of single photons and vacuum states are crucial in quantum information processing.
  • Efficient manipulation of these quantum states is essential for advancing quantum technologies.

Purpose of the Study:

  • To develop a method for converting between partially coherent superpositions of single photons and vacuum.
  • To introduce and analyze a generalized quantum efficiency for these states.
  • To establish the optimality of the proposed conversion scheme.

Main Methods:

  • Utilizing linear optical elements for quantum state manipulation.
  • Employing postselection based on homodyne measurements.
  • Introducing a generalized quantum efficiency metric.

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Main Results:

  • Demonstrated successful conversion between specified quantum states.
  • Showed that any conversion decreasing the generalized quantum efficiency is achievable.
  • Proved the optimality of the scheme for single-rail qubit input.

Conclusions:

  • The proposed linear optical scheme with postselection is an effective method for manipulating single-photon-vacuum superposition states.
  • The introduced generalized quantum efficiency provides a valuable metric for assessing state conversion.
  • The scheme's optimality highlights its potential for practical quantum applications.