Remote Implementation of Multi-qubit Quantum Phase Gates

Dong Wang, Ye Liu

Plaban Saha, Binayak Samadder Choudhury, Soumen Samanta

Yan‐Ling Li, J. C. Huang, Zhonghui Xu

Jingfu Zhang, Wenzhang Liu, Zhiwei Deng +2 more

A quantum circuit network is a set of circuits that implements a certain computation task. Being at the centre of the quantum circuit network, the multi-qubit controlled phase shift is one of the most important quantum gates. In this paper, we apply the method of modular structuring in classical computer architecture to the quantum computer and give a recursive realization of the multi-qubit phase gate. This realization of the controlled phase shift gate is convenient in realizing certain quantum algorithms. We have experimentally implemented this modularized multi-qubit controlled phase gate in a three-qubit nuclear magnetic resonance (NMR) quantum system. The network is demonstrated experimentally using line selective pulses in the NMR technique. The procedure has the advantage of being simple and easy to implement.

Juha J. Vartiainen, Mikio Nakahara, A. O. Niskanen +1 more

Pei-Min Lu, Song Jie, Yan Xia

A protocol is proposed to implement a three-qubit phase gate for photonic qubits in a three-mode cavity. The idea can be extended to directly implement a N-qubit phase gate. We also show that the interaction time remains unchanged with the increasing number of qubits. In addition, the influence of cavity decay and atomic spontaneous emission on the gate fidelity and photon loss probability is also discussed by numerical calculation.