INVESTIGADORES
OSENDA Omar
congresos y reuniones científicas
Título:
Properties and control of a hybrid qubit based on a double quantum dot
Autor/es:
ALBA RAMOS; OMAR OSENDA
Lugar:
Mar del Plata
Reunión:
Congreso; Quantum Optics VII; 2014
Institución organizadora:
Latin American Committee for Quantum Optics
Resumen:
Since the original proposal of DiVincenzo and Loss to use the spin of an
electron trapped in
a quantum dot as qubit, a lot of work has been done to circumvent the huge
difficulties associated to the implementation.
One of the major problems associated to spin qubits is the long time required
to implement quantum logical gates or other control operations. This is so
because the low strength of the coupling between the
spin and the external magnetic fields applied to the quantum dot. This low
strength causes that
the operation times are too long allowing that different coherence mechanisms
change the state
of interest. To solve such
problem, i.e. to have
shorter time operations, hybrid qubits have been proposed, so the
information is effectively stored in the
spin degrees of freedom, but the operations are implemented through
the application of electric fields.
In this poster, we analyze the performance of the hybrid qubit proposed by
Tokura et al.
(Phys. Rev. Lett. 96, 047202 (2006)), which is based in a double quantum
dot
with external magnetic fields applied to it and driven by a time dependent
electric field. To model the quantum
dot we use the Effective Mass Approximation, with a quartic well potential. We
considered the
complete magnetic field dependence, in both the orbital and spinorial parts.