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Simultaneous State Measurement of Coupled Josephson Phase Qubits

by McDermott, R , Simmonds, R. W , Pappas, D. P , Martinis, John M , Cicak, K , Oh, Seongshik , Cooper, K. B , Steffen, Matthias , Osborn, K. D

in Algorithms / Atoms & subatomic particles / computer analysis / Computers / Control loops / Coupling circuits / Crosstalk / Energy / Josephson effect / Measurement errors / Measurement Techniques / Microwaves / Oscillation / Quantum computers / Quantum computing / Quantum entanglement / Quantum field theory / Spectroscopy

2005

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Simultaneous State Measurement of Coupled Josephson Phase Qubits

by McDermott, R , Simmonds, R. W , Pappas, D. P , Martinis, John M , Cicak, K , Oh, Seongshik , Cooper, K. B , Steffen, Matthias , Osborn, K. D

2005

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Simultaneous State Measurement of Coupled Josephson Phase Qubits

by McDermott, R , Simmonds, R. W , Pappas, D. P , Martinis, John M , Cicak, K , Oh, Seongshik , Cooper, K. B , Steffen, Matthias , Osborn, K. D

2005

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Journal Article

Simultaneous State Measurement of Coupled Josephson Phase Qubits

McDermott, R,

Simmonds, R. W,

Pappas, D. P,

Martinis, John M,

Cicak, K,

Oh, Seongshik,

Cooper, K. B,

Steffen, Matthias,

Osborn, K. D

2005

Overview

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[right-pointing angle bracket] and |10[right-pointing angle bracket] 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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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

Algorithms

/ Atoms & subatomic particles