Dispersive readout of a flux qubit at the single photon level

Details Dispersive readout of a flux qubit at the single photon level Dispersive readout of a flux qubit at the single photon level

2011-09-13

arxiv.org/abs/1109.2858v2

Phys. Rev. B 84, 220503 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.84.220503

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 $\bar{n}$ = 1.5 photons, the readout visibility is increased by a factor of 4.5 over that using a cryogenic semiconductor amplifier. As $\bar{n}$ is increased from 0.008 to 0.1, no reduction in $T_1$ is observed, potentially enabling continuous monitoring of the qubit state.

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