Department of Computer Science AGH and IBM Software Laboratory in Krakow invite to Krakow Quantum Informatics Seminar (KQIS)
•    understand and discuss current problems in quantum informatics,
•    discuss new quantum computing technologies,
•    exchange ideas and research results,
•    integrate information across different research teams,
•    build a community around quantum informatics.
Venue:  Centrum Informatyki (D17) ul. Kawiory 21, 30-055 Kraków, room 1.19

Wednesday, March 20, 2019, 16:00-17:00

Grzegorz Skowron
Wydział Fizyki i Informatyki Stosowanej AGH, Kraków

Topic: Fast spin initialization of an electron trapped in a gated nanowire quantum dot



In the era when classical computing technologies are apparently nearing their pinnacle of evolution we seek for alternative solutions which could ensure continued growth of computer capabilities.
To make this happen the idea of quantum computers has been brought to life, yet scientists still strug-gle with physical realization of this concept. There are many obstacles on the way which have to be overcome first. One of them is quantum state initialization. In classical computing calculations are done starting from certain known states of variables used in an algorithm. Quantum computing is no differ-ent in this matter, as we also have to start from known quantum states. Thus, we need a method to create such known states.
If we encode bits of quantum information into electron spins, there must be a way to initialize them. In electrostatic quantum dot solid state systems the only method used thus far is relatively slow and re-quires magnetic fields.
We propose a new method, employing the Rashba spin-orbit interaction in InSb quantum nanostruc-tures, which is fast, provides predictable initialization times and does not rely on the magnetic field. This method has been successfully simulated for a planar nanodevice [1], however, recent simulations suggest much better results for quantum wires[2].

[1] S. Bednarek et al 2017 New J. Phys. 19 123006
[2] arXiv:1803.06171v2 [cond-mat.mes-hall]


  • 1 year, 3 months ago