congresos y reuniones científicas
Properties and control of a hybrid qubit based on a double quantum dot
Mar del Plata
Congreso; Quantum Optics VII; 2014
Institución organizadora:
Latin American Committee for Quantum Optics
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.