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Decoherence-driven quantum transport.

Sang Wook Kim1, Mahn-Soo Choi

  • 1Department of Physics Education, Pusan National University, Busan 609-735, Korea. swkim0412@pusan.ac.kr

Physical Review Letters
|December 31, 2005
PubMed
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We discovered a novel way to create particle currents without external voltage by balancing coherent and incoherent processes. This method utilizes interferometers for potential applications in quantum devices.

Area of Science:

  • Quantum mechanics
  • Particle physics
  • Interferometry

Background:

  • Generating directed particle currents typically requires an applied bias voltage.
  • Understanding the interplay of quantum coherence and decoherence is crucial for quantum transport phenomena.

Purpose of the Study:

  • To propose and theoretically demonstrate a new mechanism for generating a direct current (dc) of particles at zero bias.
  • To explore the role of asymmetric coherence and decoherence in particle transport.

Main Methods:

  • Theoretical modeling of particle transport through interferometers.
  • Analyzing the conditions under which a net dc current emerges.
  • Proposing implementations using atomic Michelson and ring interferometers.

Related Experiment Videos

Main Results:

  • A dc current of particles can be generated at zero bias by exploiting the interplay between coherence and decoherence.
  • Asymmetric transport, where one direction is coherent and the opposite is incoherent, is key to achieving this effect.
  • The proposed mechanism is shown to be feasible with existing interferometer setups.

Conclusions:

  • The study presents a novel mechanism for bias-free particle current generation.
  • This work offers a new perspective on controlling quantum transport by manipulating coherence and decoherence.
  • Potential applications include the development of novel quantum devices and sensors.