Heralded state preparation in a superconducting qubit

Details Heralded state preparation in a superconducting qubit Heralded state preparation in a superconducting qubit

2012-02-24

arxiv.org/abs/1202.5541v1

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

We demonstrate high-fidelity, quantum non-demolition, single shot readout of a superconducting flux qubit in which the pointer state histograms can be resolved to below one part in 1000. In the weak excitation regime, continuous measurement permits the use of heralding to ensure initialization to a fiducial state, such as the ground state. This procedure boosts readout fidelity to 93.9% by suppressing errors due to spurious thermal population. Heralding also enables a simple, fast qubit reset protocol without changing the system parameters to induce Purcell relaxation.

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