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Annalen der Physik

(Ann. Phys. 12/2023)

Published Dec 1, 2023• 0 citations
Publisher

Abstract

Rydberg Atoms Quantum gates are the backbone of digital quantum computing. In article number 2300275, Luis S. Yagüe Bosch, Sandro Wimberger, and colleagues present a shortcut-to-adiabatic protocol for the realization of a controlled-phase gate in Rydberg atoms. The adiabatic state transfer for the gate is accelerated by compensating nonadiabatic transitions via oscillating fields. High fidelities and fast operation times are obtained, and an application to a minimal quantum-error correction circuit is analyzed.

DOI
10.1002/andp.202370026

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Shortcut‐to‐Adiabatic Controlled‐Phase Gate in Rydberg Atoms [Ann. Phys. (Berlin) 2023, 12, 2300275]

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ABSTRACT This is a correction to appendix A in our paper [L. S. Yague Bosch, T. Ehret, F. Petiziol, E. Arimondo, and S. Wimberger, Shortcut‐to‐Adiabatic Controlled‐Phase Gate in Rydberg atoms, Ann. Phys. (Berlin) 2023 , 12 , 2300275].

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Rydberg Atoms Quantum gates are the backbone of digital quantum computing. In article number 2300275, Luis S. Yagüe Bosch, Sandro Wimberger, and colleagues present a shortcut-to-adiabatic protocol for the realization of a controlled-phase gate in Rydberg atoms. The adiabatic state transfer for the gate is accelerated by compensating nonadiabatic transitions via oscillating fields. High fidelities and fast operation times are obtained, and an application to a minimal quantum-error correction circuit is analyzed.
Abstract A shortcut‐to‐adiabatic protocol for the realization of a fast and high‐fidelity controlled‐phase gate in Rydberg atoms is developed. The adiabatic state transfer, driven in the high‐blockade limit, is sped up by compensating nonadiabatic transitions via oscillating fields that mimic a counterdiabatic Hamiltonian. High fidelities are obtained in wide parameter regions. The implementation of the bare effective counterdiabatic field, without original adiabatic pulses, enables to bypass gate errors produced by the accumulation of blockade‐dependent dynamical phases, making the protocol efficient also at low blockade values. As an application toward quantum algorithms, how the fidelity of the gate impacts the efficiency of a minimal quantum‐error correction circuit is analyzed.
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Fast implementation of controlled π\pi π phase gate using superadiabatic shortcuts with Rydberg superatoms
Abstract Quantum phase gates serve as core fundamental resources for quantum information processing, and their preparation effciency and structural stability directly determine the overall performance of quantum computing and quantum communication. The traditional adiabatic preparation method is prone to the influence of decoherence due to its excessive time consumption, while superadiabatic shortcut technology can significantly shorten the evolution time while retaining the advantages of the adiabatic process. In this paper, we propose a scheme for rapidly implementing a quantum phase gate by combining superadiabatic scheme and quantum Zeno dynamics to construct shortcuts to adiabatic passage. We demonstrate the superadiabatic shortcut by using Rydberg superatoms in distant-atom-cavity system. Furthermore, we utilize the controlled π phase gate to achieve the preparation of N-particles cluster states. Additionally, the impact of decoherence and operational imperfections are discussed. Numerical simulation demonstrates the proposed scheme has high fidelities and robustness against both cavity leakage and atomic spontaneous emission.
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