2,667 research outputs found
The Contribution of Hot Electron Spin Polarization to the Magnetotransport in a Spin-Valve Transistor at Finite Temperatures
The effect of spin mixing due to thermal spin waves and temperature
dependence of hot electron spin polarization to the collector current in a
spin-valve transistor has been theoretically explored. We calculate the
collector current as well as the temperature dependence of magnetocurrent at
finite temperatures to investigate the relative importance of spin mixing and
hot electron spin polarization. In this study the inelastic scattering events
in ferromagnetic layers have been taken into account to explore our interests.
The theoretical calculations suggest that the temperature dependence of hot
electron spin polarization has substantial contribution to the magnetotransport
in the spin-valve transistor.Comment: 8 pages and 6 figure
Non-Destructive Discrimination of arbitrary set of orthogonal quantum states by NMR using Quantum Phase Estimation
An algorithm based on quantum phase estimation, which discriminates quantum
states nondestructively within a set of arbitrary orthogonal states, is
described and experimentally verified by a NMR quantum information processor.
The procedure is scalable and can be applied to any set of orthogonal states.
Scalability is demonstrated through Matlab simulation
Singlet state creation and Universal quantum computation in NMR using Genetic Algorithm
Experimental implementation of a quantum algorithm requires unitary operator
decomposition. Here we treat the unitary operator decomposition as an
optimization problem and use Genetic Algorithm, a global optimization method
inspired by nature's evolutionary process for operator decomposition. As an
application, we apply this to NMR Quantum Information Processing and find a
probabilistic way of doing universal quantum computation using global hard
pulses. We also demonstrate efficient creation of singlet state (as a special
case of Bell state) directly from thermal equilibrium using an optimum sequence
of pulses
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