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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Undoing a quantum measurement.

Philipp Schindler1, Thomas Monz1, Daniel Nigg1

  • 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.

Physical Review Letters
|August 29, 2014
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Summary
This summary is machine-generated.

Researchers demonstrate the deterministic reversal of quantum measurements using quantum error correction in trapped ions. This breakthrough overcomes a fundamental limitation in quantum information processing, enabling error correction for fully projective measurements.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Atomic Physics

Background:

  • Quantum measurements are inherently irreversible, collapsing multiple initial states into one.
  • Quantum errors are analogous to measurements, posing a challenge for quantum error correction.
  • Existing protocols can correct errors affecting only parts of a quantum system.

Purpose of the Study:

  • To achieve deterministic reversal of a fully projective quantum measurement on a single particle.
  • To develop a quantum error-correction protocol for reversing projective measurements.
  • To mitigate experimental challenges like motional heating in trapped ion systems.

Main Methods:

  • Implemented a quantum error-correction protocol in a trapped ion quantum information processor.
  • Utilized a single-particle, fully projective measurement.
  • Introduced an in-sequence, single-species recooling procedure.

Main Results:

  • Successfully demonstrated the deterministic reversal of a fully projective measurement.
  • Showcased the efficacy of the quantum error-correction protocol in reversing the measurement.
  • Counteracted motional heating of the ion string caused by the measurement.

Conclusions:

  • Quantum measurements, even fully projective ones, can be deterministically reversed.
  • Quantum error correction is a viable strategy for overcoming the irreversibility of quantum measurements.
  • The developed techniques advance the capabilities of trapped ion quantum information processors.