ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

WIGNER SZFI SZEMINÁRIUM PÁLYI ANDRÁS

(BME TTK Fizika Tanszék, vendéglátó: Asbóth János)
"Donor-based spin qubits in silicon"

Időpont: 2016. november 22. (kedd) 10:00 (1 óra)
Hely: MTA Wigner FK SZFI, I. épület 1. emeleti Tanácsterem
Összefoglaló:
Recent years have seen important experimental advances toward quantum
information processing with electron spins and nuclear spins in
semiconductors. An exceptionally promising qubit system is a phosphorus
donor embedded in a silicon crystal [1]. The qubit can be encoded either in
the spin of the donor-bound electron, or the nuclear spin of the phosphorus
atom. A recent proposal [2] highlights the possibility of encoding a qubit
in the combined electron-nuclear system, providing an opportunity to use
electric fields to realize fast single-qubit and two-qubit quantum logical
operations. In the talk, I will review this proposal and present our
theoretical results on the qubit´s relaxation mechanisms and time scales
[3]. Our main conclusion is that even though the qubit lifetime can be 8
orders of magnitude shorter in the proposed nanostructure than in bulk
silicon, it is still much longer than the times required for the logical
operations.

[1] B. E. Kane, A silicon-based nuclear spin quantum computer, Nature 393,
133 (1998)
[2] G. Tosi et al., Silicon quantum processor with long-distance qubit
couplings, arXiv:1509.08538
[3] P. Boross, G. Szechenyi, A. Palyi, Valley-enhanced fast relaxation of
gate-controlled donor qubits in silicon, Nanotechnology 27, 314002 (2016)


*Részletes információ:* http://www.szfki.hu/seminar
Minden érdeklődőt szívesen látunk!

Asbóth János
szfi-seminar AT wigner.mta.hu