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Related Concept Videos

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Published on: November 11, 2013

Anomalous decoherence effect in a quantum bath.

Nan Zhao1, Zhen-Yu Wang, Ren-Bao Liu

  • 1Department of Physics and Center for Quantum Coherence, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.

Physical Review Letters
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

Quantum spin coherence can be extended by using multitransition dynamics in a nitrogen-vacancy center, even with stronger noise. This counterintuitive finding challenges conventional understanding of decoherence in quantum systems.

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Area of Science:

  • Quantum physics
  • Quantum information science
  • Materials science

Background:

  • Decoherence is a critical challenge in quantum technologies, limiting the stability of quantum states.
  • Typically, stronger environmental noise leads to faster decoherence.
  • Understanding decoherence in quantum systems is vital for advancing quantum computing and sensing.

Purpose of the Study:

  • To investigate anomalous decoherence effects in a quantum bath.
  • To explore the coherence time of multitransition dynamics in nitrogen-vacancy centers.
  • To challenge the conventional belief that stronger noise always causes faster decoherence.

Main Methods:

  • Theoretical prediction of decoherence dynamics.
  • Utilizing a nitrogen-vacancy center spin-1 in diamond as a quantum system.
  • Analyzing the influence of a nuclear spin bath on coherence times.

Main Results:

  • Multitransition dynamics of nitrogen-vacancy centers can exhibit longer coherence times than single transitions.
  • This occurs despite the multitransition process experiencing twice the noise from the nuclear spin bath.
  • The anomalous effect is attributed to the manipulation of bath evolution through center spin flips.

Conclusions:

  • Quantum systems can exhibit counterintuitive decoherence behavior in noisy environments.
  • Nitrogen-vacancy centers offer a platform to explore and potentially harness anomalous decoherence.
  • Spin manipulation techniques can be used to enhance coherence times in quantum devices.