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Entangled Macroscopic Quantum States in Two Superconducting Qubits

by Dragt, A. J. , Johnson, P. R. , Ramos, R. C. , Lobb, C. J. , Xu, H. , Strauch, F. W. , Anderson, J. R. , Wellstood, F. C. , Berkley, A. J. , Gubrud, M. A.

in Applied sciences / Capacitors / Electric potential / Electronics / Energy levels / Exact sciences and technology / Ground state / Josephson junctions / Microwaves / Quantum computers / Quantum entanglement / Quantum mechanics / Quantum theory / Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices / Spectroscopy / Superconducting devices / Superconductivity / Superconductors

2003

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Entangled Macroscopic Quantum States in Two Superconducting Qubits

by Dragt, A. J. , Johnson, P. R. , Ramos, R. C. , Lobb, C. J. , Xu, H. , Strauch, F. W. , Anderson, J. R. , Wellstood, F. C. , Berkley, A. J. , Gubrud, M. A.

2003

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Entangled Macroscopic Quantum States in Two Superconducting Qubits

by Dragt, A. J. , Johnson, P. R. , Ramos, R. C. , Lobb, C. J. , Xu, H. , Strauch, F. W. , Anderson, J. R. , Wellstood, F. C. , Berkley, A. J. , Gubrud, M. A.

2003

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Journal Article

Entangled Macroscopic Quantum States in Two Superconducting Qubits

Dragt, A. J.,

Johnson, P. R.,

Ramos, R. C.,

Lobb, C. J.,

Xu, H.,

Strauch, F. W.,

Anderson, J. R.,

Wellstood, F. C.,

Berkley, A. J.,

Gubrud, M. A.

2003

Overview

We present spectroscopic evidence for the creation of entangled macroscopic quantum states in two current-biased Josephson-junction qubits coupled by a capacitor. The individual junction bias currents are used to control the interaction between the qubits by tuning the energy level spacings of the junctions in and out of resonance with each other. Microwave spectroscopy in the 4 to 6 gigahertz range at 20 millikelvin reveals energy levels that agree well with theoretical results for entangled states. The single qubits are spatially separate, and the entangled states extend over the 0.7-millimeter distance between the two qubits.

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Publisher

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

Subject

/ Exact sciences and technology

/ Ground state