Generation of multiqubit steady-state quantum correlation by squeezed-reservoir engineering

Area of Science:

• Quantum Optics
• Quantum Information Science
• Condensed Matter Physics

Background:

• Stationary quantum correlation in steady state is a crucial resource for quantum information processing.
• Generating and maintaining quantum correlations among two-level systems (TLSs) is experimentally challenging.

Purpose of the Study:

• To propose a scheme for generating stable quantum correlation among TLSs inside a lossy cavity.
• To investigate the role of a squeezed-vacuum reservoir in creating and sustaining quantum correlations.

Main Methods:

• Applying a broadband squeezed laser as a squeezed-vacuum reservoir to a lossy cavity containing TLSs.
• Adiabatically eliminating the cavity field to derive a reduced master equation for TLSs in the bad-cavity limit.
• Analyzing the influence of system parameters (squeezing, detuning, coupling strength, decay rate) on correlation performance.

Main Results:

• A stable quantum correlation among TLSs can be generated using the proposed scheme.
• The generated quantum correlation is determined by squeezing features transferred from the reservoir via the cavity field.
• System parameters significantly affect the performance and stability of the generated quantum correlation.

Conclusions:

• The proposed scheme effectively generates stationary quantum correlation in TLSs within a lossy cavity.
• Cavity-mediated transfer of squeezing from a reservoir is key to establishing quantum correlations.
• The method is feasible with current experimental techniques, paving the way for quantum information applications.