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Mesoscopic quadratic quantum measurements.

Wenjin Mao1, Dmitri V Averin, Rusko Ruskov

  • 1Department of Physics and Astronomy, Stony Brook University, State University of New York, Stony Brook, NY 11794-3800, USA.

Physical Review Letters
|August 25, 2004
PubMed
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We introduce quadratic quantum measurements using mesoscopic detectors, revealing novel quantum information properties. This method offers a straightforward approach for entangling two noninteracting qubits.

Area of Science:

  • Quantum Information Science
  • Mesoscopic Physics
  • Quantum Measurement Theory

Background:

  • Quantum measurements are fundamental to quantum information processing.
  • Mesoscopic detectors offer unique capabilities for probing quantum systems.
  • Understanding detector response is crucial for quantum technologies.

Purpose of the Study:

  • To develop a theory for quadratic quantum measurements.
  • To explore the quantum information properties of these measurements.
  • To investigate the application in entangling qubits.

Main Methods:

  • Theoretical development of quadratic quantum measurement models.
  • Analysis of quantum information properties, including entanglement generation.
  • Calculation of output spectra for detectors with linear and quadratic responses.

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Main Results:

  • Quadratic quantum measurements exhibit nontrivial quantum information properties.
  • A simple method for entangling two noninteracting qubits is demonstrated.
  • The output spectrum of a detector monitoring two qubits is calculated.

Conclusions:

  • Quadratic quantum measurements provide a powerful tool for quantum information tasks.
  • This work offers a new pathway for quantum entanglement generation.
  • The theoretical framework can guide the design of advanced quantum detectors.