ELFT HÍRADÓ

[Andras Palyi <andraspalyi AT caesar.elte.hu>]

A BME-MTA Egzotikus Kvantum Fázisok kutatócsoport következő szemináriuma: 


Dimitrie Culcer (University of New South Wales, Sydney, Ausztrália)

“FULLY TUNABLE COHERENCE AND CONTROL OF ACCEPTOR QUBITS"

Kivonat: “Electrical control of quantum bits could pave the way for scalable 
quantum computation. An acceptor spin qubit in Si, based on spin-3/2 holes, 
can be controlled by electrical means using a gate electrode, which offers 
fast one- and two-qubit rotations and long coherence times at certain sweet 
spots. The relaxation time T1, while allowing >10^5 operations, is the 
primary limiting factor. I will show that, due to the interplay of the Td 
symmetry of the acceptor in the Si lattice and the spin-3/2 characteristic of 
hole systems, an applied in-plane magnetic field strongly enhances the 
performance and coherence properties of the qubit. An appropriate choice of 
magnetic field orientation leads to a near-total suppression of spin 
relaxation as well as full tunability of two-qubit operations in a parameter 
regime in which dephasing due to charge fluctuations can be eliminated. 
Interestingly for spintronic applications, an extreme in-plane anisotropy 
exists such that the in-plane g-factor can vanish under certain 
circumstances."


Helye: BME Fizikai Intézet, Elméleti Fizika Tanszék
Budafoki út 8., F épület, III. lépcsőház, magasföldszint, szemináriumi szoba

Ideje: 2017. július 11. (kedd), 14:15.


Minden érdeklődőt szívesen látunk.


Üdvözlettel,
Pályi András