Implementing a neutral-atom controlled-phase gate with a single Rydberg pulse

¹ Centre for Quantum Technologies, National University of Singapore - 117543 Singapore
² Max Planck Institute for the Science of Light - 91058 Erlangen, Germany, EU
³ Institute of Optics, Information and Photonics, University of Erlangen-Nürnberg - 91058 Erlangen, Germany, EU
⁴ Yale-NUS College - 138609 Singapore
⁵ MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, UMI 3654 - Singapore
⁶ Department of Physics, National University of Singapore - 117542 Singapore

Received: 4 December 2015
Accepted: 19 February 2016

Abstract

One can implement fast two-qubit entangling gates by exploiting the Rydberg blockade. Although various theoretical schemes have been proposed, experimenters have not yet been able to demonstrate two-atom gates of high fidelity due to experimental constraints. We propose a novel scheme, which only uses a single Rydberg pulse illuminating both atoms, for the construction of neutral-atom controlled-phase gates. In contrast to the existing schemes, our approach is simpler to implement and requires neither individual addressing of atoms nor adiabatic procedures. With parameters estimated based on actual experimental scenarios, a gate fidelity higher than 0.99 is achievable.