Generalized rotating-wave approximation to biased qubit-oscillator systems
The generalized rotating-wave approximation with counter-rotating interactions has been applied to a biased qubit-oscillator system. Analytical expressions are explicitly given for all eigenvalues and eigenstates. For a flux qubit coupled to superconducting oscillators, spectra calculated by our a...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/96547 http://hdl.handle.net/10220/9919 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The generalized rotating-wave approximation with counter-rotating interactions has been applied to a biased
qubit-oscillator system. Analytical expressions are explicitly given for all eigenvalues and eigenstates. For a
flux qubit coupled to superconducting oscillators, spectra calculated by our approach are in excellent agreement
with experiment. Calculated energy levels for a variety of biases also agree well with those obtained via exact
diagonalization for a wide range of coupling strengths. Dynamics of the qubit has also been examined, and results
lend further support to the validity of the analytical approximation employed here. Our approach can be readily
implemented and applied to superconducting qubit-oscillator experiments conducted currently and in the near
future with a biased qubit and for all accessible coupling strengths. |
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