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Implementation of quantum state manipulation in a dissipative cavity.

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This study demonstrates a novel method for quantum state manipulation using atomic spontaneous emission and cavity decay. The technique creates robust many-body entanglement, improving fidelity even in noisy quantum environments.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum optics

Background:

  • Quantum state manipulation is crucial for quantum technologies.
  • Dissipative processes in quantum systems are often considered detrimental.
  • Achieving robust entanglement in realistic noisy environments remains a challenge.

Purpose of the Study:

  • To introduce a method for quantum state manipulation assisted by dissipation.
  • To investigate the potential of atomic spontaneous emission and cavity decay for generating many-body entanglement.
  • To assess the protocol's performance and robustness against noise.

Main Methods:

  • Utilizing atomic spontaneous emission as a resource for state preparation.
  • Employing cavity decay to drive a system towards a desired steady state.
  • Analyzing the generation of many-body steady-state entanglement.
  • Quantifying the fidelity of the entangled state under varying noise conditions.

Main Results:

  • Demonstrated dissipation-assisted generation of many-body steady-state entanglement.
  • Showcased significant improvement in quantum state fidelity with increasing noise.
  • Confirmed effective suppression of dephasing noise.
  • Achieved high-fidelity target state preparation in a dissipative environment.

Conclusions:

  • Dissipation can be harnessed as a resource for quantum state manipulation and entanglement generation.
  • The proposed protocol offers enhanced robustness against environmental noise, particularly dephasing.
  • This method provides a promising pathway for building reliable quantum devices in realistic conditions.