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Tuning decoherence with a voltage probe.

P Roulleau1, F Portier, P Roche

  • 1Nanoelectronic group, Service de Physique de l'Etat Condensé, CEA Saclay, F-91191 Gif-Sur-Yvette, France.

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Researchers tuned quantum decoherence in an electronic Mach-Zehnder interferometer using an Ohmic contact. This setup acts as a tunable which-path detector, demonstrating control over quantum interference patterns.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum electronics

Background:

  • Quantum interference is sensitive to decoherence.
  • Ohmic contacts are fundamental in quantum conductors.
  • Controlling decoherence is key to understanding quantum phenomena.

Purpose of the Study:

  • To investigate the use of an Ohmic contact to tune decoherence in a quantum interferometer.
  • To demonstrate a tunable which-path detector based on quantum interference.
  • To explore the relationship between voltage probes and quantum interference visibility.

Main Methods:

  • Designed an electronic Mach-Zehnder interferometer.
  • Connected one arm to an Ohmic contact via a quantum point contact.
  • Tuned the connection strength using a gate voltage.
  • Measured quantum interference patterns at low temperatures.

Main Results:

  • Observed quantum interference patterns with up to 57% visibility.
  • Increasing the Ohmic contact connection reduced interference visibility.
  • The voltage probe effectively acted as a which-path detector.
  • Interference visibility was tunable via gate voltage.

Conclusions:

  • An Ohmic contact can effectively tune decoherence in a quantum interferometer.
  • The experimental setup serves as a simple, tunable which-path detector.
  • This work provides insights into controlling quantum phenomena in electronic devices.