Journal
PHYSICAL REVIEW A
Volume 87, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.87.013826
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Funding
- ARO
- NSF [0726909]
- JSPS-RFBR [09-02-92114]
- MEXT Kakenhi on Quantum Cybernetics
- JSPS via its FIRST program
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We consider the phase-transition-like behavior in the Rabi model containing a single two-level system, or qubit, and a single harmonic oscillator. The system experiences a sudden transition from an uncorrelated state to an increasingly correlated one as the qubit-oscillator coupling strength is varied and increased past a critical point. This singular behavior occurs in the limit where the oscillator's frequency is much lower than the qubit's frequency; away from this limit one obtains a finite-width transition region. By analyzing the energy-level structure, the value of the oscillator field and its squeezing and the qubit-oscillator correlation, we gain insight into the nature of the transition and the associated critical behavior. DOI: 10.1103/PhysRevA.87.013826
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