Heralded quantum controlled-phase gates with dissipative dynamics in macroscopically distant resonators

Wei Qin, Xin Wang, Adam Miranowicz, Zhirong Zhong, and Franco Nori
Phys. Rev. A 96, 012315 – Published 11 July 2017

Abstract

Heralded near-deterministic multiqubit controlled-phase gates with integrated error detection have recently been proposed by Borregaard et al. [Phys. Rev. Lett. 114, 110502 (2015)]. This protocol is based on a single four-level atom (a heralding quartit) and N three-level atoms (operational qutrits) coupled to a single-resonator mode acting as a cavity bus. Here we generalize this method for two distant resonators without the cavity bus between the heralding and operational atoms. Specifically, we analyze the two-qubit controlled-Z gate and its multiqubit-controlled generalization (i.e., a Toffoli-like gate) acting on the two-lowest levels of N qutrits inside one resonator, with their successful actions being heralded by an auxiliary microwave-driven quartit inside the other resonator. Moreover, we propose a circuit-quantum-electrodynamics realization of the protocol with flux and phase qudits in linearly coupled transmission-line resonators with dissipation. These methods offer a quadratic fidelity improvement compared to cavity-assisted deterministic gates.

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  • Received 15 August 2016

DOI:https://doi.org/10.1103/PhysRevA.96.012315

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Wei Qin1,2, Xin Wang1,3, Adam Miranowicz1,4, Zhirong Zhong1,5, and Franco Nori1,6

  • 1CEMS, RIKEN, Wako-shi, Saitama 351-0198, Japan
  • 2School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • 3Institute of Quantum Optics and Quantum Information, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
  • 4Faculty of Physics, Adam Mickiewicz University, 61-614 Poznań, Poland
  • 5Department of Physics, Fuzhou University, Fuzhou 350002, China
  • 6Physics Department, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Issue

Vol. 96, Iss. 1 — July 2017

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