Entanglement of superconducting charge qubits by homodyne measurement

D. A. Rodrigues; C. E A Jarvis; B. L. Györffy; T. P. Spiller; J. F. Annett

doi:10.1088/0953-8984/20/7/075211

Entanglement of superconducting charge qubits by homodyne measurement

D. A. Rodrigues^*, C. E A Jarvis, B. L. Györffy, T. P. Spiller, J. F. Annett

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We present a scheme by which projective homodyne measurement of a microwave resonator can be used to generate entanglement between two superconducting charge qubits coupled to this resonator. The non-interacting qubits are initialized in a product of their ground states, the resonator is initialized in a coherent field state, and the state of the system is allowed to evolve under a rotating wave Hamiltonian. Making a homodyne measurement on the resonator at a given time projects the qubits into a state of the form . This protocol can produce states with a fidelity as high as required, with a probability approaching 0.5. Although the system described is one that can be used to display revival in the qubit oscillations, we show that the entanglement procedure works at much shorter timescales.

Original language	English
Article number	075211
Journal	Journal of physics : Condensed matter
Volume	20
Issue number	7
DOIs	https://doi.org/10.1088/0953-8984/20/7/075211
Publication status	Published - 20 Feb 2008

Access to Document

10.1088/0953-8984/20/7/075211

Cite this

@article{edd5617ddc2145868b025791b97762ee,

title = "Entanglement of superconducting charge qubits by homodyne measurement",

abstract = "We present a scheme by which projective homodyne measurement of a microwave resonator can be used to generate entanglement between two superconducting charge qubits coupled to this resonator. The non-interacting qubits are initialized in a product of their ground states, the resonator is initialized in a coherent field state, and the state of the system is allowed to evolve under a rotating wave Hamiltonian. Making a homodyne measurement on the resonator at a given time projects the qubits into a state of the form . This protocol can produce states with a fidelity as high as required, with a probability approaching 0.5. Although the system described is one that can be used to display revival in the qubit oscillations, we show that the entanglement procedure works at much shorter timescales.",

author = "Rodrigues, {D. A.} and Jarvis, {C. E A} and Gy{\"o}rffy, {B. L.} and Spiller, {T. P.} and Annett, {J. F.}",

year = "2008",

month = feb,

day = "20",

doi = "10.1088/0953-8984/20/7/075211",

language = "English",

volume = "20",

journal = "Journal of physics : Condensed matter",

issn = "0953-8984",

publisher = "IOP Publishing",

number = "7",

}

TY - JOUR

T1 - Entanglement of superconducting charge qubits by homodyne measurement

AU - Rodrigues, D. A.

AU - Jarvis, C. E A

AU - Györffy, B. L.

AU - Spiller, T. P.

AU - Annett, J. F.

PY - 2008/2/20

Y1 - 2008/2/20

N2 - We present a scheme by which projective homodyne measurement of a microwave resonator can be used to generate entanglement between two superconducting charge qubits coupled to this resonator. The non-interacting qubits are initialized in a product of their ground states, the resonator is initialized in a coherent field state, and the state of the system is allowed to evolve under a rotating wave Hamiltonian. Making a homodyne measurement on the resonator at a given time projects the qubits into a state of the form . This protocol can produce states with a fidelity as high as required, with a probability approaching 0.5. Although the system described is one that can be used to display revival in the qubit oscillations, we show that the entanglement procedure works at much shorter timescales.

AB - We present a scheme by which projective homodyne measurement of a microwave resonator can be used to generate entanglement between two superconducting charge qubits coupled to this resonator. The non-interacting qubits are initialized in a product of their ground states, the resonator is initialized in a coherent field state, and the state of the system is allowed to evolve under a rotating wave Hamiltonian. Making a homodyne measurement on the resonator at a given time projects the qubits into a state of the form . This protocol can produce states with a fidelity as high as required, with a probability approaching 0.5. Although the system described is one that can be used to display revival in the qubit oscillations, we show that the entanglement procedure works at much shorter timescales.

UR - http://www.scopus.com/inward/record.url?scp=38949104359&partnerID=8YFLogxK

U2 - 10.1088/0953-8984/20/7/075211

DO - 10.1088/0953-8984/20/7/075211

M3 - Article

AN - SCOPUS:38949104359

SN - 0953-8984

VL - 20

JO - Journal of physics : Condensed matter

JF - Journal of physics : Condensed matter

IS - 7

M1 - 075211

ER -

Entanglement of superconducting charge qubits by homodyne measurement

Abstract

Access to Document

Other files and links

Cite this