Recoil-Free Quantum Gates for High-Fidelity Operations in Optical Qubit Systems

Abstract

We present a novel approach for implementing recoil-free quantum gates using optical qubits in trapped atoms and ions, achieving suppression of photon recoil by three orders of magnitude compared to conventional techniques [1]. This method significantly improves the fidelity of quantum gate operations, paving the way for scalable quantum computing applications. Our analytical insights establish fundamental limits on qubit fidelity and introduce a composite pulse protocol that enables the execution of over 1000 quantum gates with an overall fidelity exceeding 99%. The proposed protocol addresses key challenges such as photon recoil, motional decoherence, and probe shifts, making it a promising candidate for high-precision quantum computing and quantum metrology. These advancements mark a crucial step toward implementing large-scale quantum processors based on optical qubits.

[1] Zhang, Zhao, et al. "Recoil-free Quantum Gates with Optical Qubits." arXiv preprint arXiv:2408.04622 (2024)

Authors:
Marco Rossignolo (Qruise)
Zhao Zhang (Max-Planck-Institut fur Quantenoptik)
Leo van Damme (School of Natural Sciences, Technical University of Munich)
Lorenzo Festa (Max-Planck-Institut for Quantenoptik)
Max Melchner von Dydiowa (Max-Planck-Institut fur Quantenoptik)
Robin Eberhard (Max-Planck-Institut fur Quantenoptik)
Dimitrios Tsevas (Max-Planck-Institut fur Quantenoptik)
Eran Reches (Max-Planck-Institut fur Quantenoptik)
Johannes Zeiher (Max Planck Institute of Quantum Optics)
Sebastian Blatt (Max Planck Institute of Quantum Optics)
Immanuel Bloch (Max-Planck-Institut fur Quantenoptik)
Steffen Glaser (School of Natural Sciences, Technical University of Munich)
Andrea Alberti (Max-Planck-Institut fur Quantenoptik)