Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits

• URL: http://arxiv.org/abs/2309.15463v2
• Date: Sat, 2 Mar 2024 07:25:45 GMT
• Title: Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits
• Authors: Holly G. Stemp, Serwan Asaad, Mark R. van Blankenstein, Arjen Vaartjes, Mark A. I. Johnson, Mateusz T. M\k{a}dzik, Amber J. A. Heskes, Hannes R. Firgau, Rocky Y. Su, Chih Hwan Yang, Arne Laucht, Corey I. Ostrove, Kenneth M. Rudinger, Kevin Young, Robin Blume-Kohout, Fay E. Hudson, Andrew S. Dzurak, Kohei M. Itoh, Alexander M. Jakob, Brett C. Johnson, David N. Jamieson and Andrea Morello
• Abstract summary: Quantum processors require high-fidelity universal quantum logic operations. No entanglement between donor-bound electron spins has been demonstrated to date. These results form the necessary basis for scaling up donor-based quantum computers.
• Score: 26.72272277499726
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Scalable quantum processors require high-fidelity universal quantum logic operations in a manufacturable physical platform. Donors in silicon provide atomic size, excellent quantum coherence and compatibility with standard semiconductor processing, but no entanglement between donor-bound electron spins has been demonstrated to date. Here we present the experimental demonstration and tomography of universal 1- and 2-qubit gates in a system of two weakly exchange-coupled electrons, bound to single phosphorus donors introduced in silicon by ion implantation. We surprisingly observe that the exchange interaction has no effect on the qubit coherence. We quantify the fidelity of the quantum operations using gate set tomography (GST), and we use the universal gate set to create entangled Bell states of the electrons spins, with fidelity ~ 93%, and concurrence 0.91 +/- 0.08. These results form the necessary basis for scaling up donor-based quantum computers.

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