Seminario de Sorin Paraoanu (Aalto University, Finland)

 

Vivere pericolosamente in the quantum world:
 driving at the quantum speed limit and taking
shortcuts to adiabaticity”

Sorin Paraoanu
(Aalto University, Finland)

Abstract:

The achievement of fast and error-insensitive control of quantum systems is a pri-
mary goal in quantum information science. Here we use the first three levels of a
transmon superconducting circuit to realize a loop driving scheme, with all three
possible pairs of states coupled by pulsed microwave tones. We demonstrate
that the population can be controlled by the synthetic gauge-invariant phase around
the loop as well as by the amplitudes of the three pulses. In the same configuration,
we implement a shortcut-to-adiabaticity protocol where two couplings produce
the standard stimulated Raman adiabatic passage, while the third is a counterdiabatic
field which suppresses the nonadiabatic excitations. The technique enables fast
operation, with transfer times approaching the quantum speed limit, and it is
remarkably robust against errors in the shape of the pulses.

References:
A Vepsäläinen, S Danilin, GS Paraoanu, Optimal superadiabatic population transfer and gates by dynamical phase corrections,
Quantum Science and Technology 3 (2), 024006 (2018)
Antti Vepsäläinen, Sergey Danilin, Sorin Paraoanu, Superadiabatic population transfer by loop driving and synthetic gauges in a superconducting circuit, arXiv:1709.03731

Fecha: miércoles 6 de febrero de 2019
Hora:   10:00
Lugar: Seminario de Física Atómica, Molecular y Nuclear

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