Engineered selection rules for tunable coupling in a superconducting quantum circuit

K. Harrabi, F. Yoshihara, Antti Niskanen, Y. Nakamura, J.S. Tsai

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)

Abstract

Engineering selection rules of transitions is a useful strategy for coupling and decoupling qubits in superconducting quantum circuits. Following this approach, we implement a tunable coupling scheme between two flux qubits. The qubits are coupled parametrically under microwave driving via the nonlinear inductance of a third qubit. The measured on-state coupling as well as the off-state residual coupling depends on the coupler bias and agrees quantitatively with a calculation of transition matrix elements of a three-qubit Hamiltonian.
Original languageEnglish
Article number020507
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume79
Issue number2
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Hamiltonians
Inductance
Microwaves
Fluxes
Networks (circuits)
inductance
decoupling
couplers
engineering
microwaves

Keywords

  • quantum computing
  • SQUID
  • qubits
  • coupling
  • decoupling

Cite this

Harrabi, K. ; Yoshihara, F. ; Niskanen, Antti ; Nakamura, Y. ; Tsai, J.S. / Engineered selection rules for tunable coupling in a superconducting quantum circuit. In: Physical Review B: Condensed Matter and Materials Physics. 2009 ; Vol. 79, No. 2.
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Engineered selection rules for tunable coupling in a superconducting quantum circuit. / Harrabi, K.; Yoshihara, F.; Niskanen, Antti; Nakamura, Y.; Tsai, J.S.

In: Physical Review B: Condensed Matter and Materials Physics, Vol. 79, No. 2, 020507, 2009.

Research output: Contribution to journalArticleScientificpeer-review

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AB - Engineering selection rules of transitions is a useful strategy for coupling and decoupling qubits in superconducting quantum circuits. Following this approach, we implement a tunable coupling scheme between two flux qubits. The qubits are coupled parametrically under microwave driving via the nonlinear inductance of a third qubit. The measured on-state coupling as well as the off-state residual coupling depends on the coupler bias and agrees quantitatively with a calculation of transition matrix elements of a three-qubit Hamiltonian.

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KW - SQUID

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KW - decoupling

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