Role of relaxation in the quantum measurement of a superconducting qubit using a nonlinear oscillator
| Autor: | Picot, T., Lupascu, A., Saito, S., Harmans, C. J. P. M., Mooij, J. E. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.78.132508 |
| Popis: | We analyze the relaxation of a superconducting flux qubit during measurement. The qubit state is measured with a nonlinear oscillator driven across the threshold of bifurcation, acting as a switching dispersive detector. This readout scheme is of quantum non-demolition type. Two successive readouts are used to analyze the evolution of the qubit and the detector during the measurement. We introduce a simple transition rate model to characterize the qubit relaxation and the detector switching process. Corrected for qubit relaxation the readout fidelity is at least 95%. Qubit relaxation strongly depends on the driving strength and the state of the oscillator. Comment: 4 pages, 4 figures |
| Databáze: | arXiv |
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