title: Coherent control of a single ²⁹Si nuclear spin qubit.
abstract: Magnetic fluctuations caused by the nuclear spins of a host crystal are often the leading source of decoherence for many types of solid-state spin qubit. In group-IV semiconductor materials, the spin-bearing nuclei are sufficiently rare that it is possible to identify and control individual host nuclear spins. This Letter presents the first experimental detection and manipulation of a single ²⁹Si nuclear spin. The quantum nondemolition single-shot readout of the spin is demonstrated, and a Hahn echo measurement reveals a coherence time of T₂=6.3(7)  ms—in excellent agreement with bulk experiments. Atomistic modeling combined with extracted experimental parameters provides possible lattice sites for the ²⁹Si atom under investigation. These results demonstrate that single ²⁹Si nuclear spins could serve as a valuable resource in a silicon spin-based quantum computer.
authors.affiliation: Centre of Excellence for Quantum Computation and Communication Technology, Sydney, New South Wales 2052, Australia and School of Electrical Engineering and Telecommunications, The University of New South Wales Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Jarryd J
authors.initials: JJ
authors.lastname: Pla
authors.affiliation: Centre of Excellence for Quantum Computation and Communication Technology, Sydney, New South Wales 2052, Australia and School of Electrical Engineering and Telecommunications, The University of New South Wales Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Fahd A
authors.initials: FA
authors.lastname: Mohiyaddin
authors.affiliation: Centre of Excellence for Quantum Computation and Communication Technology, Sydney, New South Wales 2052, Australia and School of Electrical Engineering and Telecommunications, The University of New South Wales Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Kuan Y
authors.initials: KY
authors.lastname: Tan
authors.affiliation: Centre of Excellence for Quantum Computation and Communication Technology, Sydney, New South Wales 2052, Australia and School of Electrical Engineering and Telecommunications, The University of New South Wales Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Juan P
authors.initials: JP
authors.lastname: Dehollain
authors.affiliation: Network for Computational Nanotechnology, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Rajib
authors.initials: R
authors.lastname: Rahman
authors.affiliation: Network for Computational Nanotechnology, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Klimeck
authors.affiliation: Centre of Excellence for Quantum Computation and Communication Technology, Melbourne, Victoria 3010, Australia and School of Physics, University of Melbourne, Melbourne, Victoria 3010, Australia.
authors.forename: David N
authors.initials: DN
authors.lastname: Jamieson
authors.affiliation: Centre of Excellence for Quantum Computation and Communication Technology, Sydney, New South Wales 2052, Australia and School of Electrical Engineering and Telecommunications, The University of New South Wales Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Dzurak
authors.affiliation: Centre of Excellence for Quantum Computation and Communication Technology, Sydney, New South Wales 2052, Australia and School of Electrical Engineering and Telecommunications, The University of New South Wales Australia, Sydney, New South Wales 2052, Australia.
authors.forename: Andrea
authors.initials: A
authors.lastname: Morello