arXiv subjects

Jinshuang Jin

Publications and source records attributed to Jinshuang Jin.

40 records · Page 3Linked to original sources

arXiv2006

Quantum coherence control of solid-state charge qubit by means of a suboptimal feedback algorithm

The quantum coherence control of a solid-state charge qubit is studied by using a suboptimal continuous feedback algorithm within the Bayesian feedback scheme. For the coherent Rabi oscillation, the present algorithm suggests a simple bang-bang control protocol, in which the control parameter is modulated between two values. For the coherence protection of idle state, the present approach is applicable to arbitrary states, including those lying on the equator of the Bloch sphere which are out of control in the previous Markovian feedback scheme.

cond-mat.other↗

arXiv2006

Theory on the Ultrafast Manipulation of Electron Spin by Optical Means

Based on a multi-particle-state stimulated Raman adiabatic passage approach, a comprehensive theoretical study on the ultrafast optical manipulation of electron spins in quantum wells is presented. In addition to corroborating the experimental findings [Science {\bf 292}, 2458 (2001)], we improve the expression of the optical-pulse-induced effective magnetic field, in comparison with the one obtained via the conventional single-particle ac-Stark shift. Further study of the effect of hole spin relaxation reveals that while the coherent optical manipulation of electron spin in undoped quantum wells would deteriorate in the presence of relatively fast hole-spin relaxation, the coherent control in doped systems can be quite robust against the decoherence. The implications of present results on quantum dots will also be discussed.

cond-mat.mes-hall↗

arXiv2006

Quantum trajectory analysis for electrical detection of single-electron spin resonance

A Monte Carlo simulation on the basis of quantum trajectory approach is carried out for the measurement dynamics of a single electron spin resonance. The measured electron, which is confined in either a quantum dot or a defect trap, is tunnel-coupled to a side reservoir and continuously monitored by a mesoscopic detector. The simulation not only recovers the observed telegraphic signal of detector current, but also predicts unique features in the output power spectrum which are associated with electron dynamics in different regimes.

cond-mat.mes-hall↗

arXiv2005

Measurement of single electron spin with sub-micron Hall magnetometer

Submicron Hall magnetometry has been demonstrated as an efficient technique to probe extremely weak magnetic fields. In this letter, we analyze the possibility of employing it to detect single electron spin. Signal strength and readout time are estimated and discussed with respect to a number of practical issues.

cond-mat.mes-hall↗