INVESTIGADORES
SEGNORILE Hector Hugo
congresos y reuniones científicas
Título:
Oral presentation: NMR-like experiments in superconducting quantum systems
Autor/es:
HÉCTOR H. SEGNORILE; GÖRAN JOHANSSON; VITALY S. SHUMEIKO
Lugar:
Alta Gracia (Córdoba)
Reunión:
Congreso; Magnetic Resonance in a Cordubensis Perspective VI: New Developments in NMR; 2011
Resumen:
A
wide variety of systems, useful for application in quantum computation (or
quantum processing of the information), are available by the design of qubits
using superconducting Josephson junctions1. In those devices the
handling of the qubit with microwave pulses is possible. The application of
those pulses permits to study decoherence in the signals generated by the qubit,
which is produced by the interaction with spurious two level systems (TLS),
such as parasitic electric dipoles. In that way, using different NMR-like
refocusing techniques2 we can mitigate the decay of the coherences,
and also we can study the properties of the TLS-qubit coupling.
Other interesting system, of recent
concern, is a superconducting coplanar waveguide (CPW) resonator coupled with
spins embedded in a solid state matrix, for instance a crystal doped with
rare-earths ions3. Integrating a qubit with the resonator allows
transferring of the state of the qubit to spins coupled to the resonator, thus
realizing a quantum memory of the qubit state.
In this work, we present a description of
the dynamic of a qubit-TLS system.
The results obtained from a simulation of
the polarization, show a remarkable enhancement of the coherence time by
applying a pulse sequence (see A, in poster). In addition, we study the
coupling between a CPW resonator and the spins in a crystal doped with
rare-earths ions under a semi-classical approach that permits to identify a
resistive effect of the spins over the resonator circuit under the resonance
condition, which is important for a perfect absorption of the microwave
photons.
REFERENCES:
G.
Wendin; and V.S. Shumeiko, arXiv:cond-mat/0508729v1, 2005.
J.
Bylander; S. Gustavsson; F. Yan; F. Yoshihara; K. Harrabi; G. Fitch; D. G.
Cory; Y. Nakamura; J.-S. Tsai; and W. D. Oliver, arXiv:1101.4707v1, 2011.
P. Bushev; A.
K. Feofanov; H. Rotzinger; I. Protopopov; J. H. Cole; G. Fischer; A.
Lukashenko; and A. V. Ustinov, arXiv:1102.3841v1, 2011.