Fast manipulation of a single electron along a quantum dot chain

RUS, MARÍA E; PONCE, CLAUDIO A; ROMERO, RODOLFO H; GOMEZ, SERGIO S

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

IOP PUBLISHING LTD

Año: 2021 vol. 54

0953-4075

We present a protocol based on shortcuts to adiabaticity for the manipulation of an electron ina linear quantum dot array of arbitrary size on an InSb heterostructure. We propose a modelwhere the couplings between neighboring dots have a particular form, related to a spinoperator that depends on the size of the chain. The system is driven by an electric field with amodified Landau?Zener time-dependence. We find that the transmission of the electron fromthe first site to the last one can be achieved with any desired fidelity (99.9% or even more) bychoosing the appropriate evolution time of the system according to the length of the chain.Then, we consider Rashba spin?orbit (SO) interaction effects and possible chain defects andfind that transmission probabilities are larger than 90% for moderate intensity of SOinteractions. However, we can increase even more the fidelity by increasing the static magneticfield, since it would diminish the effect of the SO mechanism in the dynamics.