Scalable simultaneous multi-qubit readout with 99.99% single-shot fidelity

Details Scalable simultaneous multi-qubit readout with 99.99% single-shot fidelity Scalable simultaneous multi-qubit readout with 99.99% single-shot fidelity

2009-06-18

arxiv.org/abs/0906.3304v2

Phys. Rev. A 81, 040302(R) (2010)

Physics

Quantum Physics

4 pages, 3 figures; simulations added to fig.3, with some further text and figure revisions. Main results unchanged.

Scientific paper

10.1103/PhysRevA.81.040302

We describe single-shot readout of a trapped-ion multi-qubit register using space and time-resolved camera detection. For a single qubit we measure 0.9(3)x10^{-4} readout error in 400us exposure time, limited by the qubit's decay lifetime. For a four-qubit register (a "qunybble") we measure an additional error of only 0.1(1)x10^{-4} per qubit, despite the presence of 4% optical cross-talk between neighbouring qubits. A study of the cross-talk indicates that the method would scale with negligible loss of fidelity to ~10000 qubits at a density <~1 qubit/um^2, with a readout time ~1us/qubit.

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