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Single-shot measurement of the Josephson charge qubit

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arxiv cond-mat/0402619 v1 pith:6H52HWVH submitted 2004-02-25 cond-mat.mes-hall cond-mat.supr-con

O. Astafiev , Yu. A. Pashkin , T. Yamamoto , Y. Nakamura , J. S. Tsai This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.supr-con
keywords chargequbitbitsislandjosephsonquantumreadoutsingle-shot
verification ladder T0 review T1 audit T2 compute T3 formal
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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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