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Sympathetic Cooling in Long Yb<sup>+</sup> Chains

ORAL

Abstract

In trapped-ion systems, quantum computation is limited by motional heating due to fluctuating electric fields, shuttling operations, and mid-circuit measurements. While direct Doppler cooling techniques alter the qubits’ quantum state, sympathetic cooling with a mixed atomic species can counter this problem. Using different-mass atomic species for cooling alters the ions’ motional modes, slowing down the cooling and degrading the performance of motional ion gates. We minimize the effects of mass imbalance by cooling 171Yb+ using the 2S1/2-2D3/2 transition in 172Yb+ to remove motional energy, while using a laser near-resonant with the 2D3/2-3D[3/2]1/2 transition for state reset. The small mass imbalance enables efficient cooling of both axial and radial modes of chains of ≥15 Yb+ ions, while limiting crosstalk errors in nearby 171Yb+ hyperfine qubits to <5×10-4 per qubit, per cooling cycle. 

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Publication: Cetina et al., arXiv:2007.06768 (2020)

Presenters

  • Marko Cetina

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham, NC 27701, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham NC 27701, University of Maryland, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham NC 27, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2

Authors

  • Marko Cetina

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham, NC 27701, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham NC 27701, University of Maryland, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics, Duke University, Durham NC 27, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2

  • Laird Egan

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742, University of Maryland, College Park, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center, Duke University, Durham NC 27701, Joint Quantum Institute and Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, MD 20742

  • Debopriyo Biswas

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742, University of Maryland, College Park, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742;, Joint Quantum Institute and Center for Quantum Information and Computer Science, NIST/University of Maryland, College Park, MD 20742

  • Or Katz

    Duke University, Department of Electrical and Computer Engineering, Duke University, Durham, NC 277084

  • Crystal Noel

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham, NC, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2, University of Maryland, College Park

  • Daiwei Zhu

    JQI and QuICS and Departments of ECE and Physics, University of Maryland, College Park, MD 20742

  • Andrew Risinger

    JQI and QuICS and Departments of ECE and Physics, University of Maryland, College Park, MD 20742, Joint Quantum Institute, University of Maryland, College Park, University of Maryland, College Park, JQI and QuICS and Departments of Physics and ECE, University of Maryland, College Park, MD 20742

  • Christopher R Monroe

    JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham, NC, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2, University of Maryland, College Park, Joint Quantum Institute, University of Maryland, College Park, Joint Quantum Institute and Joint Center for Quantum Information and Computer Science, University of Maryland and NIST, College Park, MD 20742 USA, JQI, University of Maryland, College Park, JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 27, Joint Quantum Institute, Joint Center for Quantum Information and Computer Science, and Physics Department, University of Maryland, College Park and National Institute of Sta