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Heralded quantum gates with integrated error detection in optical cavities.

J Borregaard1, P Kómár2, E M Kessler2,3

  • 1The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.

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|April 4, 2015
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Summary

We introduce heralded quantum gates for optical cavities, converting errors into a success probability. These gates achieve high fidelity, crucial for quantum repeater networks and faster entanglement distribution.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Communication

Background:

  • Deterministic quantum gates in optical cavities are prone to errors.
  • Improving gate fidelity is essential for scalable quantum computation and communication.

Purpose of the Study:

  • To propose and analyze heralded quantum gates for enhanced fidelity in optical cavities.
  • To develop near-deterministic controlled phase (CZ) and N-qubit Toffoli gates.

Main Methods:

  • Utilizing an auxiliary qubit to herald successful gate operations.
  • Analyzing gate performance based on system cooperativity (C).

Main Results:

  • Heralded CZ gates achieve conditional errors near zero and success probability approaching unity with large cooperativity.
  • Demonstrated extension to near-deterministic N-qubit Toffoli gates with favorable error scaling.

Conclusions:

  • Heralded gates offer a pathway to high-fidelity quantum operations in optical cavities.
  • These gates are directly applicable to quantum repeater networks for efficient entanglement swapping and distribution.