Simultaneous State Measurement of Coupled Josephson Phase Qubits
Abstract
One of the many challenges of building a scalable quantum computer is single-shot measurement of all the quantum bits (qubits). We have used simultaneous single-shot measurement of coupled Josephson phase qubits to directly probe interaction of the qubits in the time domain. The concept of measurement crosstalk is introduced, and we show that its effects are minimized by careful adjustment of the timing of the measurements. We observe the antiphase oscillation of the two-qubit |01〉 and |10〉 states, consistent with quantum mechanical entanglement of these states, thereby opening the possibility for full characterization of multiqubit gates and elementary quantum algorithms.
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At this frequency, the spectra of both qubits were free of fine structure normally attributed to spurious junction resonances (9).
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Supported in part by the National Security Agency (NSA) Advanced Research and Development Activity (ARDA) through Army Research Office grants W911NF-04-1-2004 and MOD717304.
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Published In
Science
Volume 307 | Issue 5713
25 February 2005
25 February 2005
Copyright
American Association for the Advancement of Science.
Submission history
Received: 16 November 2004
Accepted: 6 January 2005
Published in print: 25 February 2005
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