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Single-Shot Readout and Relaxation of Singlet and Triplet States in Exchange-Coupled P31 Electron Spins in Silicon

Juan P. Dehollain, Juha T. Muhonen, Kuan Y. Tan, Andre Saraiva, David N. Jamieson, Andrew S. Dzurak, and Andrea Morello
Phys. Rev. Lett. 112, 236801 – Published 9 June 2014
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Abstract

We present the experimental observation of a large exchange coupling J300μeV between two P31 electron spin qubits in silicon. The singlet and triplet states of the coupled spins are monitored in real time by a single-electron transistor, which detects ionization from tunnel-rate-dependent processes in the coupled spin system, yielding single-shot readout fidelities above 95%. The triplet to singlet relaxation time T14ms at zero magnetic field agrees with the theoretical prediction for J-coupled P31 dimers in silicon. The time evolution of the two-electron state populations gives further insight into the valley-orbit eigenstates of the donor dimer, valley selection rules and relaxation rates, and the role of hyperfine interactions. These results pave the way to the realization of two-qubit quantum logic gates with spins in silicon and highlight the necessity to adopt gating schemes compatible with weak J-coupling strengths.

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  • Received 28 February 2014

DOI:https://doi.org/10.1103/PhysRevLett.112.236801

© 2014 American Physical Society

Authors & Affiliations

Juan P. Dehollain1, Juha T. Muhonen1, Kuan Y. Tan1,*, Andre Saraiva2,3, David N. Jamieson4, Andrew S. Dzurak1, and Andrea Morello1,†

  • 1Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, UNSW Australia, Sydney, New South Wales 2052, Australia
  • 2Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, Brazil
  • 3University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 4Centre for Quantum Computation and Communication Technology, School of Physics, University of Melbourne, Melbourne, Victoria 3010, Australia

  • *Present address: QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University, 00076 Aalto, Finland.
  • a.morello@unsw.edu.au

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Issue

Vol. 112, Iss. 23 — 13 June 2014

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