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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Discrete single-photon quantum walks with tunable decoherence.

M A Broome1, A Fedrizzi, B P Lanyon

  • 1Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane 4072, Australia.

Physical Review Letters
|May 21, 2010
PubMed
Summary
This summary is machine-generated.

We demonstrate a stable, deterministic quantum walk using single photons. This method scales efficiently and allows exploration of quantum decoherence effects on walk behavior and absorption.

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Area of Science:

  • Quantum information science
  • Quantum optics
  • Condensed matter physics simulation

Background:

  • Quantum walks are fundamental tools with applications in quantum computing and simulating complex systems.
  • Previous implementations often faced challenges with stability and scalability.
  • Discrete quantum walks offer a framework for quantum algorithms and simulations.

Purpose of the Study:

  • To present a stable, deterministic, and scalable implementation of discrete quantum walks.
  • To investigate the quantum-to-classical transition using tunable decoherence.
  • To study the impact of absorbing boundaries on quantum walks with decoherence.

Main Methods:

  • Implementation of discrete quantum walks using single photons in a spatial optical setup.
  • Linear scaling of optical elements with the number of walk steps.
  • Introduction of tunable decoherence to probe quantum effects.
  • Measurement of quantum walks up to 6 steps.
  • Investigation of absorbing boundary conditions.

Main Results:

  • Demonstrated an intrinsically stable and deterministic quantum walk implementation.
  • Showcased linear scalability in optical elements with walk length.
  • Quantified the quantum-to-classical transition by controlling decoherence.
  • Observed significant influence of decoherence on absorption probabilities at boundaries.

Conclusions:

  • The presented method offers a robust platform for quantum walk experiments.
  • Tunable decoherence is crucial for understanding quantum walk dynamics and transitions.
  • Decoherence plays a critical role in phenomena involving boundaries, such as absorption.