科研之友
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摘要
A superconducting flux qubit is inductively coupled to a superconducting quantum interference device (SQUID) magnetometer, capacitively shunted to form a 1.294-GHz resonator. The qubit-state-dependent resonator frequency is weakly probed with a microwave signal and detected with a microstrip SQUID amplifier. At a mean resonator occupation (n) over bar = 1.5 photons, the readout visibility is increased by a factor of 4.5 over that using a cryogenic semiconductor amplifier. As (n) over bar is increased from 0.008 to 0.1, no reduction in T(1) is observed, potentially enabling continuous monitoring of the qubit state.
- 出版日期2011-12-15
