Fast quantum gate with superconducting flux qubits coupled to a cavity

TL;DR

This paper proposes a rapid two-qubit controlled phase gate for superconducting flux qubits coupled to a cavity, utilizing resonant interactions to enhance speed and simplicity without requiring qubit parameter adjustments or precise placement.

Contribution

It introduces a fast, efficient gate implementation method that avoids qubit parameter tuning and precise qubit placement, improving upon previous approaches.

Findings

Gate operation is significantly faster than previous methods.

No adjustment of qubit levels needed during operation.

Does not require uniform qubit parameters or exact placement.

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.