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All-optical measurement-based quantum-information processing in quantum dots.

Avinash Kolli1, Brendon W Lovett, Simon C Benjamin

  • 1Department of Materials, Oxford University, Oxford OX1 3PH, United Kingdom. avinash.kolli@materials.ox.ac.uk

Physical Review Letters
|February 7, 2007
PubMed
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We present a fast optical method for parity measurements on electron spin qubits in quantum dots, crucial for scalable quantum computation. This technique is robust against errors and enables applications like controlled-NOT gates and graph state generation.

Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Quantum Optics

Background:

  • Parity measurements are essential for generating entanglement in quantum computation.
  • Electron spin qubits in coupled quantum dots offer a promising platform for quantum information processing.

Purpose of the Study:

  • To introduce a novel, fast optical method for parity measurements on electron spin qubits.
  • To demonstrate the feasibility and robustness of this measurement scheme using existing technology.

Main Methods:

  • Optical excitation of excitonic states followed by monitored relaxation.
  • Projection into odd/even-parity subspaces conditional on photon detection.
  • Analytical modeling of error sources including detector inefficiency and dot properties.

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Main Results:

  • The proposed scheme achieves fast optical parity measurements on electron spin qubits.
  • The method is shown to be robust against primary error sources.
  • Demonstrated potential for realizing controlled-NOT gates and scalable graph state generation.

Conclusions:

  • Fast optical parity measurements are achievable with current technology for electron spin qubits.
  • The presented scheme provides a viable route towards scalable quantum computation and advanced quantum state preparation.