arXiv:1207.7065 · Progress of Theoretical Physics

Fast Quantum Gate with Superconducting Flux Qubits Coupled to a Cavity

Chun-Yao Yang

Published Apr 1, 2012• 0 citations

Abstract

We present a way for fast implementation of a two-qubit controlled phase gate with superconducting flux qubits coupled to a cavity. A distinct feature of this proposal is that since only qubit-cavity resonant interaction and qubit-pulse resonant interaction are used, the gate can be performed much faster when compared with the previous proposals. This proposal does not require adjustment of the qubit level spacings during the gate operation. In addition, neither uniformity in the qubit parameters nor exact placement of qubits in the cavity is needed by this proposal.

DOI: 10.1143/ptp.127.781

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arXiv:1207.7065 · Progress of Theoretical Physics

Fast Quantum Gate with Superconducting Flux Qubits Coupled to a Cavity

Chun-Yao Yang

Published Apr 1, 2012• 0 citations

arXiv HTML PDF

Abstract

DOI: 10.1143/ptp.127.781

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\sqrt {n}

| only and thus the gate can be performed faster when compared with sending atoms through the cavity one at a time. In addition, only three operational steps are required to realize this n-target-qubit controlled-phase gate. This proposal is quite general and can be applied to other physical systems, such as various superconducting qubits coupled to a resonator, NV centers coupled to a microsphere cavity, or quantum dots in cavity QED.

We propose a way to realize a multiqubit tunable phase gate of one qubit simultaneously controlling

n

target qubits with atoms in cavity QED. In this proposal, classical pulses interact with atoms outside a cavity only, thus the experimental challenge of applying a pulse to an intracavity single atom without affecting other atoms in the same cavity is avoided. Because of employing a first-order large detuning, the gate can be performed fast when compared with the use of a second-order large detuning. Furthermore, the gate operation time is independent of the number of qubits. This proposal is quite general and can be applied to various superconducting qubits coupled to a resonator, nitrogen-vacancy centers coupled to a microsphere cavity, or quantum dots in cavity QED.