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Coherent manipulation of coupled Josephson charge qubits

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Coherent manipulation of coupled Josephson charge qubits. / Pashkin, Yuri; Yamamoto, T.; Astafiev, Oleg V. et al.
In: Physica C: Superconductivity and its Applications, Vol. 426-431, No. 2, 01.10.2005, p. 1552-1560.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Pashkin, Y, Yamamoto, T, Astafiev, OV, Nakamura, Y, Averin, DV, Tilma, T, Nori, F & Tsai, J-S 2005, 'Coherent manipulation of coupled Josephson charge qubits', Physica C: Superconductivity and its Applications, vol. 426-431, no. 2, pp. 1552-1560. https://doi.org/10.1016/j.physc.2005.01.076

APA

Pashkin, Y., Yamamoto, T., Astafiev, O. V., Nakamura, Y., Averin, D. V., Tilma, T., Nori, F., & Tsai, J.-S. (2005). Coherent manipulation of coupled Josephson charge qubits. Physica C: Superconductivity and its Applications, 426-431(2), 1552-1560. https://doi.org/10.1016/j.physc.2005.01.076

Vancouver

Pashkin Y, Yamamoto T, Astafiev OV, Nakamura Y, Averin DV, Tilma T et al. Coherent manipulation of coupled Josephson charge qubits. Physica C: Superconductivity and its Applications. 2005 Oct 1;426-431(2):1552-1560. Epub 2005 Jul 19. doi: 10.1016/j.physc.2005.01.076

Author

Pashkin, Yuri ; Yamamoto, T. ; Astafiev, Oleg V. et al. / Coherent manipulation of coupled Josephson charge qubits. In: Physica C: Superconductivity and its Applications. 2005 ; Vol. 426-431, No. 2. pp. 1552-1560.

Bibtex

@article{d7c2058645154626a4d62e621145ca8d,
title = "Coherent manipulation of coupled Josephson charge qubits",
abstract = "We have analyzed and measured the quantum coherent dynamics of a circuit containing two-coupled superconducting charge qubits. Each qubit is based on a Cooper pair box connected to a reservoir electrode through a Josephson junction. Two qubits are coupled electrostatically by a small island overlapping both Cooper pair boxes. Quantum state manipulation of the qubit circuit is done by applying non-adiabatic voltage pulses to the common gate. We read out each qubit by means of probe electrodes connected to Cooper pair boxes through high-Ohmic tunnel junctions. With such a setup, the measured pulse-induced probe currents are proportional to the probability for each qubit to have an extra Cooper pair after the manipulation. As expected from theory and observed experimentally, the measured pulse-induced current in each probe has two frequency components whose position on the frequency axis can be externally controlled. This is a result of the inter-qubit coupling which is also responsible for the avoided level crossing that we observed in the qubits{\textquoteright} spectra. Our simulations show that in the absence of decoherence and with a rectangular pulse shape, the system remains entangled most of the time reaching maximally entangled states at certain instances.",
keywords = "Quantum computing, Solid-state qubits, Quantum coherence, Entanglement",
author = "Yuri Pashkin and T. Yamamoto and Astafiev, {Oleg V.} and Y. Nakamura and Averin, {D. V.} and T. Tilma and F. Nori and Jaw-Shen Tsai",
year = "2005",
month = oct,
day = "1",
doi = "10.1016/j.physc.2005.01.076",
language = "English",
volume = "426-431",
pages = "1552--1560",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "2",

}

RIS

TY - JOUR

T1 - Coherent manipulation of coupled Josephson charge qubits

AU - Pashkin, Yuri

AU - Yamamoto, T.

AU - Astafiev, Oleg V.

AU - Nakamura, Y.

AU - Averin, D. V.

AU - Tilma, T.

AU - Nori, F.

AU - Tsai, Jaw-Shen

PY - 2005/10/1

Y1 - 2005/10/1

N2 - We have analyzed and measured the quantum coherent dynamics of a circuit containing two-coupled superconducting charge qubits. Each qubit is based on a Cooper pair box connected to a reservoir electrode through a Josephson junction. Two qubits are coupled electrostatically by a small island overlapping both Cooper pair boxes. Quantum state manipulation of the qubit circuit is done by applying non-adiabatic voltage pulses to the common gate. We read out each qubit by means of probe electrodes connected to Cooper pair boxes through high-Ohmic tunnel junctions. With such a setup, the measured pulse-induced probe currents are proportional to the probability for each qubit to have an extra Cooper pair after the manipulation. As expected from theory and observed experimentally, the measured pulse-induced current in each probe has two frequency components whose position on the frequency axis can be externally controlled. This is a result of the inter-qubit coupling which is also responsible for the avoided level crossing that we observed in the qubits’ spectra. Our simulations show that in the absence of decoherence and with a rectangular pulse shape, the system remains entangled most of the time reaching maximally entangled states at certain instances.

AB - We have analyzed and measured the quantum coherent dynamics of a circuit containing two-coupled superconducting charge qubits. Each qubit is based on a Cooper pair box connected to a reservoir electrode through a Josephson junction. Two qubits are coupled electrostatically by a small island overlapping both Cooper pair boxes. Quantum state manipulation of the qubit circuit is done by applying non-adiabatic voltage pulses to the common gate. We read out each qubit by means of probe electrodes connected to Cooper pair boxes through high-Ohmic tunnel junctions. With such a setup, the measured pulse-induced probe currents are proportional to the probability for each qubit to have an extra Cooper pair after the manipulation. As expected from theory and observed experimentally, the measured pulse-induced current in each probe has two frequency components whose position on the frequency axis can be externally controlled. This is a result of the inter-qubit coupling which is also responsible for the avoided level crossing that we observed in the qubits’ spectra. Our simulations show that in the absence of decoherence and with a rectangular pulse shape, the system remains entangled most of the time reaching maximally entangled states at certain instances.

KW - Quantum computing

KW - Solid-state qubits

KW - Quantum coherence

KW - Entanglement

U2 - 10.1016/j.physc.2005.01.076

DO - 10.1016/j.physc.2005.01.076

M3 - Journal article

VL - 426-431

SP - 1552

EP - 1560

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 2

ER -