Single-step implementation of a multiple-target-qubit controlled phase gate without need of classical pulses

Abstract

We propose a simple method for realizing a multiqubit phase gate of one qubit simultaneously controlling $n$ target qubits, by using three-level quantum systems (i.e., qutrits) coupled to a cavity or resonator. The gate can be implemented using one operational step and without need of classical pulses, and no photon is populated during the operation. Thus, the gate operation is greatly simplified and decoherence from the cavity decay is much reduced, when compared with the previous proposals. In addition, the operation time is independent of the number of qubits and no adjustment of the qutrit level spacings or the cavity frequency is needed during the operation.

4 pages, 3 figures

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• Circuit QED: single-step realization of a multiqubit controlled phase gate with one microwave photonic qubit simultaneously controlling $n-1$ microwave photonic qubits
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• One-step implementation of a multi-target-qubit controlled-phase gate with photonic qubits encoded via eigenstates of the photon-number parity operator
• Simplify proposal for realizing multiqubit tunable phase gate in circuit QED
• One-step implementation of a multi-target-qubit controlled phase gate with cat-state qubits in circuit QED
• Transferring entangled states of photonic cat-state qubits in circuit QED