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HL: Fachverband Halbleiterphysik

HL 55: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 2 (jointly with MA, HL) (joint session TT/HL)

HL 55.11: Vortrag

Donnerstag, 19. März 2020, 12:15–12:30, HSZ 03

Electron transport and spin qubit manipulation with surface acoustic waves — •Mikel Olano¹ and Geza Giedke^1,2 — ¹Donostia International Physics Center, Donostia, Spain — ²Ikerbasque Foundation for Science, Bilbao, Spain

Spin qubits in quantum dots are among the most promising systems for the implementation of quantum computation. While coherence times and gate operation times have become very competitive, the realization of long-range interactions to enable more flexible quantum gates remains a challenge.

Here we investigate theoretically an approach to tackle this problem using a moving electrons trapped in the potential of a surface acoustic wave, that serves as an intermediary between distant stationary quantum dots.

We analyse the coherent transport and transfer of spin qubits between stationary and moving dots and quantum gates between two interacting spin qubits. Applications for the generation of multipartite entanglement and joint measurement of several qubits are discussed. The talk will highlight the parameters to be taken into account if these processes are to be optimized. The impact of the main sources of decoherence and non-adiabatic behaviour due to the time-dependence of the potential are discussed.