Coherent coupling between a quantum dot and a donor in silicon

Patrick Harvey-Collard (), N. Tobias Jacobson, Martin Rudolph, Jason Dominguez, Gregory A. Ten Eyck, Joel R. Wendt, Tammy Pluym, John King Gamble, Michael P. Lilly, Michel Pioro-Ladrière and Malcolm S. Carroll ()
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Patrick Harvey-Collard: Université de Sherbrooke
N. Tobias Jacobson: Center for Computing Research, Sandia National Laboratories
Martin Rudolph: Sandia National Laboratories
Jason Dominguez: Sandia National Laboratories
Gregory A. Ten Eyck: Sandia National Laboratories
Joel R. Wendt: Sandia National Laboratories
Tammy Pluym: Sandia National Laboratories
John King Gamble: Center for Computing Research, Sandia National Laboratories
Michael P. Lilly: Center for Integrated Nanotechnologies, Sandia National Laboratories
Michel Pioro-Ladrière: Université de Sherbrooke
Malcolm S. Carroll: Sandia National Laboratories

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Individual donors in silicon chips are used as quantum bits with extremely low error rates. However, physical realizations have been limited to one donor because their atomic size causes fabrication challenges. Quantum dot qubits, in contrast, are highly adjustable using electrical gate voltages. This adjustability could be leveraged to deterministically couple donors to quantum dots in arrays of qubits. In this work, we demonstrate the coherent interaction of a 31P donor electron with the electron of a metal-oxide-semiconductor quantum dot. We form a logical qubit encoded in the spin singlet and triplet states of the two-electron system. We show that the donor nuclear spin drives coherent rotations between the electronic qubit states through the contact hyperfine interaction. This provides every key element for compact two-electron spin qubits requiring only a single dot and no additional magnetic field gradients, as well as a means to interact with the nuclear spin qubit.

Date: 2017
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DOI: 10.1038/s41467-017-01113-2

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