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arXiv:0709.2135 · Nature

Coupling superconducting qubits via a cavity bus

Johannes Majer, Jerry M. Chow, Jay Gambetta, Jens Koch, Blake Johnson, J. A. Schreier, Luigi Frunzio, David Schuster, Andrew Houck, Andreas J. Wallraff, Alexandre Blais, Michel Devoret, S. M. Girvin, Robert J. Schoelkopf

Published Sep 1, 2007• 1,372 citations
arXivHTMLPDF
DOI
10.1038/nature06184

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We study a coupling (decoupling) method between a superconducting qubit and a data bus that uses a controllable time-dependent electromagnetic field (TDEF). As in recent experiments, the data bus can be either an LCLCLC circuit or a cavity field. When the qubit and the data bus are initially fabricated, their detuning should be made far larger than their coupling constant, so these can be treated as two independent subsystems. However, if a TDEF is applied to the qubit, then a ``dressed qubit'' (i.e., qubit plus the electromagnetic field) can be formed. By choosing appropriate parameters for the TDEF, the dressed qubit can be coupled to the data bus and, thus, the qubit and the data bus can exchange information with the assistance of the TDEF. This mechanism allows the scalability of the circuit to many qubits. With the help of the TDEF, any two qubits can be selectively coupled to (and decoupled from) a common data bus. Therefore, quantum information can be transferred from one qubit to another.