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Repeat-until-success linear optics distributed quantum computing.

Yuan Liang Lim1, Almut Beige, Leong Chuan Kwek

  • 1Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BZ, United Kingdom.

Physical Review Letters
|August 11, 2005
PubMed
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This study shows distributed quantum computing is possible using single photons, linear optics, and detectors. This method enables universal two-qubit gates without direct qubit interaction or pre-entangled resources.

Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Optics

Background:

  • Distributed quantum computing requires robust methods for entangling remote qubits.
  • Existing schemes often rely on complex interactions or pre-prepared entangled states.

Purpose of the Study:

  • To demonstrate a novel approach for distributed quantum computing using only single photons.
  • To implement a universal two-qubit gate without direct qubit-qubit interaction.

Main Methods:

  • Encoding qubits in stable ground states of single-photon sources (atom-cavity-like systems).
  • Utilizing linear optics and photon detectors for gate implementation.
  • Heralding successful gate operations via photon measurement without qubit destruction.

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Main Results:

  • Successfully demonstrated a method for performing distributed quantum computing.
  • Implemented a heralded universal two-qubit gate using single photons.
  • Showcased a protocol that avoids explicit qubit-qubit interactions and pre-entangled ancillas.

Conclusions:

  • This work presents a viable and resource-efficient pathway towards distributed quantum computation.
  • The proposed scheme offers an alternative to existing methods, potentially simplifying experimental setups.