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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Generating Stable Spin Squeezing by Squeezed-Reservoir Engineering.

Si-Yuan Bai1, Jun-Hong An1

  • 1Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou University, Lanzhou 730000, China.

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|September 3, 2021
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Summary
This summary is machine-generated.

This study introduces a new method for generating spin squeezing (SS) in quantum systems without complex experimental setups. The technique enhances precision measurements and shows promise for advanced quantum sensing applications.

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Area of Science:

  • Quantum physics
  • Quantum optics
  • Condensed matter physics

Background:

  • Spin squeezing (SS) is a many-body entangled state enabling measurements beyond classical limits.
  • Existing methods for generating SS often require complex experimental setups, such as coherent driving of two-level systems (TLSs).

Purpose of the Study:

  • To propose a novel scheme for generating stable spin squeezing.
  • To overcome the experimental limitations of previous SS generation methods.

Main Methods:

  • Utilizing the mediation effect of a common waveguide for N two-level systems (TLSs).
  • Employing squeezed-reservoir engineering techniques.
  • Avoiding the need for spin-spin coupling or coherent driving on individual TLSs.

Main Results:

  • The proposed scheme generates stable spin squeezing.
  • The scaling relation of the SS parameter with the number of TLSs shows advantages over previous methods.
  • The generated SS exhibits long-range correlation along the waveguide.

Conclusions:

  • The developed scheme offers a more experimentally feasible approach to generating spin squeezing.
  • The long-range correlation of SS has potential applications in quantum sensing, such as detecting weak magnetic fields.