INVESTIGADORES
LOMBARDO Fernando Cesar
artículos
Título:
Corrections to the Berry phase in a solid-state qubit due to low-frequency noise
Autor/es:
FERNANDO C. LOMBARDO AND PAULA I. VILLAR
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2014 vol. 89 p. 121101 - 121108
ISSN:
1050-2947
Resumen:
We present a quantum open-system approach to analyze the nonunitary
dynamics of a superconducting qubit when it evolves under the influence
of external noise. We consider the presence of longitudinal and
transverse environmental fluctuations affecting the system's dynamics
and model these fluctuations by defining their correlation function in
time. By using a Gaussian-like noise correlation, we can study low- and
high-frequency noise contribution to decoherence and implement our
results in the computation of geometric phases in open quantum systems.
We numerically study when the accumulated phase of a solid-state qubit
can still be found close to the unitary (Berry) one. Our results can be
used to explain experimental measurements of the Berry phase under
high-frequency fluctuations and design experimental future setups when
manipulating superconducting qubits.