Operation and scale-up of single-atom spin qubits in silicon

Andrea Morello
Event Date and Time: 
Wed, 2017-02-08 10:00 - 11:00
RM 318 - Hennings (6224 Agricultural Road)
Local Contact: 
Swarn Rai - 604-822-1383 or pitpoffice@phas.ubc.ca

Spins in silicon constitute excellent solid-state qubits, because of the weak spin-orbit coupling and the possibility to remove nuclear spins from the environment through 28Si isotopic enrichment. Substitutional 31P atoms in silicon behave approximately like hydrogen in vacuum, providing two spin 1/2 qubits -- the donor-bound electron and the 31P nucleus -- that can be coherently controlled, read out in single-shot, and are naturally coupled through the hyperfine interaction.

In this talk I will review the state of the art in 31P spin qubits in silicon. These single-atom qubits have demonstrated outstanding coherence times, up to 35 seconds for the nuclear spin, and 1-qubit gate fidelities well above 99.9% for both the electron and the nucleus. The electron and the nucleus can be entangled, resulting in a violation of Bell’s inequality with S = 2.70, a record value for solid-state qubits. Despite being identical atomic systems, 31P atoms can be addressed individually by locally modifying the hyperfine interaction through electrostatic gating.

Multi-qubit logic gates can be mediated either by the exchange interaction or by electric dipole coupling.

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