Implementation of a scalable universal two-qubit quantum processor with electron and nuclear spins in a trapped ion

• URL: http://arxiv.org/abs/2407.01196v1
• Date: Mon, 1 Jul 2024 11:40:45 GMT
• Title: Implementation of a scalable universal two-qubit quantum processor with electron and nuclear spins in a trapped ion
• Authors: Ji Bian, Teng Liu, Qifeng Lao, Min Ding, Huiyi Zhang, Xinxin Rao, Pengfei Lu, Le Luo,
• Abstract summary: We propose a scalable n-ion-2n-qubit quantum processor utilizing four internal levels of each ion. We experimentally implement a 1-ion-2-qubit universal processor using the electron spin and nuclear spin of a single 171Yb+ ion. Our work paves the way towards achieving 2n-times increase in the size of quantum computational Hilbert space with n ions.
• Score: 3.2872851729958867
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Increasing the quantum information processing power with limited number of hosts is vital for achieving quantum advantage. Here we propose a novel scheme that achieves a scalable n-ion-2n-qubit quantum processor utilizing four internal levels of each ion, and experimentally implement a 1-ion-2-qubit universal processor using the valence electron spin and nuclear spin of a single 171Yb+ ion. Fidelities of single-qubit and two-qubit gates are around 0.98 obtained by quantum process tomography. Additionally, the Grover's algorithm is implemented with a successful rate exceeding 0.99. We provide explicit scaling-up protocols based on standard laser-less and laser-based frameworks, and further demonstrate that the electron/nuclear-spin scheme allows less demanding two-qubit entangling gates between different ions. The replacement of some inter-atomic gates by intra-atomic gates could increase the fidelity of some quantum circuits. Our work paves the way towards achieving 2n-times increase in the size of quantum computational Hilbert space with n ions.

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