Silicon quantum processor with robust long-distance qubit couplings

Guilherme Tosi (), Fahd A. Mohiyaddin, Vivien Schmitt, Stefanie Tenberg, Rajib Rahman, Gerhard Klimeck and Andrea Morello ()
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Guilherme Tosi: School of Electrical Engineering & Telecommunications, UNSW
Fahd A. Mohiyaddin: School of Electrical Engineering & Telecommunications, UNSW
Vivien Schmitt: School of Electrical Engineering & Telecommunications, UNSW
Stefanie Tenberg: School of Electrical Engineering & Telecommunications, UNSW
Rajib Rahman: Purdue University
Gerhard Klimeck: Purdue University
Andrea Morello: School of Electrical Engineering & Telecommunications, UNSW

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract Practical quantum computers require a large network of highly coherent qubits, interconnected in a design robust against errors. Donor spins in silicon provide state-of-the-art coherence and quantum gate fidelities, in a platform adapted from industrial semiconductor processing. Here we present a scalable design for a silicon quantum processor that does not require precise donor placement and leaves ample space for the routing of interconnects and readout devices. We introduce the flip-flop qubit, a combination of the electron-nuclear spin states of a phosphorus donor that can be controlled by microwave electric fields. Two-qubit gates exploit a second-order electric dipole-dipole interaction, allowing selective coupling beyond the nearest-neighbor, at separations of hundreds of nanometers, while microwave resonators can extend the entanglement to macroscopic distances. We predict gate fidelities within fault-tolerance thresholds using realistic noise models. This design provides a realizable blueprint for scalable spin-based quantum computers in silicon.

Date: 2017
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DOI: 10.1038/s41467-017-00378-x

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