Single-shot measurement of the Josephson charge qubit

Details Single-shot measurement of the Josephson charge qubit Single-shot measurement of the Josephson charge qubit

2004-02-25

arxiv.org/abs/cond-mat/0402619v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted to Rapid Communications of Phys. Rev. B (february 2004)

Scientific paper

10.1103/PhysRevB.69.180507

We demonstrate single-shot readout of quantum states of the Josephson charge qubit. The quantum bits are transformed into and stored as classical bits (charge quanta) in a dynamic memory cell - a superconducting island. The transformation of state |1> (differing form state |0> by an extra Cooper pair) is a result of a controllable quasiparticle tunneling to the island. The charge is then detected by a conventional single-electron transistor, electrostatically decoupled from the qubit. We study relaxation dynamics in the system and obtain the readout efficiency of 87% and 93% for |1> and |0> states, respectively.

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