Single-shot measurement of the Josephson charge qubit
O. Astafiev, Yu. A. Pashkin, T. Yamamoto, Y. Nakamura, J. S. Tsai
DOI 10.1103/PhysRevB.69.180507 · Physical Review B
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Abstract
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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| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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