Parametrically-induced tunable coupling between flux qubits - dependence on the coupler bias

Khalil Harrabi; Fumiki Yoshihara; Antti Niskanen; Yasunobu Nakamura; Jaw-Shen Tsai

doi:10.1088/1742-6596/150/2/022023

Parametrically-induced tunable coupling between flux qubits - dependence on the coupler bias

Khalil Harrabi
, Fumiki Yoshihara
, Antti Niskanen
, Yasunobu Nakamura
, Jaw-Shen Tsai

VTT Technical Research Centre of Finland

Japan Science and Technology Agency (JST)
RIKEN The Institute of Physical and Chemical Research
VTT (former employee or external)
NEC Corporation

Research output: Contribution to journal › Article in a proceedings journal › Scientific › peer-review

Abstract

We have studied a tunable coupling scheme of two superconducting flux qubits biased at the degeneracy point. The qubits are coupled parametrically under microwave driving, via nonlinear inductance of a third qubit biased slightly away from the degeneracy point. The observed on-state coupling as well as the off-state residual coupling depend non-monotonically on the coupler bias point and agree quantitatively with calculations based on a three-qubit Hamiltonian. This simple model is useful to optimize the parameters for a large on/off ratio.

Original language	English
Article number	22023
Number of pages	4
Journal	Journal of Physics: Conference Series
Volume	150
DOIs	https://doi.org/10.1088/1742-6596/150/2/022023
Publication status	Published - 2009
MoE publication type	A4 Article in a conference publication
Event	25th International Conference on Low Temperature Physics (LT25) - Amsterdam, Netherlands Duration: 6 Aug 2008 → 13 Aug 2008

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title = "Parametrically-induced tunable coupling between flux qubits - dependence on the coupler bias",

abstract = "We have studied a tunable coupling scheme of two superconducting flux qubits biased at the degeneracy point. The qubits are coupled parametrically under microwave driving, via nonlinear inductance of a third qubit biased slightly away from the degeneracy point. The observed on-state coupling as well as the off-state residual coupling depend non-monotonically on the coupler bias point and agree quantitatively with calculations based on a three-qubit Hamiltonian. This simple model is useful to optimize the parameters for a large on/off ratio.",

author = "Khalil Harrabi and Fumiki Yoshihara and Antti Niskanen and Yasunobu Nakamura and Jaw-Shen Tsai",

year = "2009",

doi = "10.1088/1742-6596/150/2/022023",

language = "English",

volume = "150",

journal = "Journal of Physics: Conference Series",

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note = "25th International Conference on Low Temperature Physics (LT25) ; Conference date: 06-08-2008 Through 13-08-2008",

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T1 - Parametrically-induced tunable coupling between flux qubits - dependence on the coupler bias

AU - Harrabi, Khalil

AU - Yoshihara, Fumiki

AU - Niskanen, Antti

AU - Nakamura, Yasunobu

AU - Tsai, Jaw-Shen

PY - 2009

Y1 - 2009

N2 - We have studied a tunable coupling scheme of two superconducting flux qubits biased at the degeneracy point. The qubits are coupled parametrically under microwave driving, via nonlinear inductance of a third qubit biased slightly away from the degeneracy point. The observed on-state coupling as well as the off-state residual coupling depend non-monotonically on the coupler bias point and agree quantitatively with calculations based on a three-qubit Hamiltonian. This simple model is useful to optimize the parameters for a large on/off ratio.

AB - We have studied a tunable coupling scheme of two superconducting flux qubits biased at the degeneracy point. The qubits are coupled parametrically under microwave driving, via nonlinear inductance of a third qubit biased slightly away from the degeneracy point. The observed on-state coupling as well as the off-state residual coupling depend non-monotonically on the coupler bias point and agree quantitatively with calculations based on a three-qubit Hamiltonian. This simple model is useful to optimize the parameters for a large on/off ratio.

U2 - 10.1088/1742-6596/150/2/022023

DO - 10.1088/1742-6596/150/2/022023

M3 - Article in a proceedings journal

SN - 1742-6588

VL - 150

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

M1 - 22023

T2 - 25th International Conference on Low Temperature Physics (LT25)

Y2 - 6 August 2008 through 13 August 2008

ER -

Parametrically-induced tunable coupling between flux qubits - dependence on the coupler bias

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