Work

High-fidelity and robust controlled- Z gates implemented with Rydberg atoms via echoing rapid adiabatic passage

Year: 2024

Type: article

Abstract: High-fidelity and robust quantum gates are essential for quantum information processing, with neutral Rydberg atoms trapped in optical tweezer arrays serving as a versatile platform for the implementation. We propose a rapid adiabatic passage (RAP) scheme for achieving a high-fidelity controlled-$Z$ (CZ) gate on a neutral-atom Rydberg platform. Utilizing only global laser dressing, our scheme involves echoing two identical RAP pulses within the Rydberg blockade regime to realize a CZ gate and can be readily extended to a ${\mathrm{C}}^{k}\mathrm{Z}$ gate with additional qubits. We predict a CZ gate with fidelity over 0.9995 using alkali-metal atom parameters, and a CCZ gate with fidelity exceeding 0.999. Moreover, the direct utilization of echoing RAP pulses enables the implementation of a four-bit CCCZ gate at fidelity over 0.996 without further optimization. The proposed scheme, remarkably robust to variations in driving fields and realistic decoherence effects, holds promise for future quantum information processing applications.

Source: Physical Review A

DOI: 10.1103/physreva.110.032619

Authors: Ming Xue, Shijie Xu, Xinwei Li, Xiangliang Li

Institutions: Nanjing University of Aeronautics and Astronautics, Beijing Academy of Quantum Information Sciences

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: National Natural Science Foundation of China

Awards: G132622915, G5986770721