QUANTUM DYNAMICS OF DOUBLE QUBIT IN A SPIN STAR LATTICE WITH AN x–y INTERACTION

2009 ◽  
Vol 23 (07) ◽  
pp. 911-923 ◽  
Author(s):  
JUN JING ◽  
ZHIGUO LÜ ◽  
HONG-RU MA
Keyword(s):  
Low Temperature ◽  
Coupling Strength ◽  
Quantum Dynamics ◽  
Laguerre Polynomial ◽  
Bell States ◽  
Product State ◽  
Spin Bath ◽  
Polynomial Scheme

The dynamics of two spins-1/2 interacting with a spin-bath via the quantum Heisenberg x–y coupling is studied. The purity, z-component summation and the concurrence of the central subsystem are determined by the Laguerre polynomial scheme. It is found that (i) at a low temperature, the uncoupled subsystem in a product state can be entangled by the bath, which is tested by the Peres–Horodecki separability; (ii) the resistance of the subsystem in Bell states to the destroy effect from the bath increases with its inner-coupling strength.

Quantum dynamics in low-temperature chemistry

1993 ◽  
Vol 233 (4-5) ◽  
pp. 195-339 ◽  
Author(s):  
V.A. Benderskii ◽  
V.I. Goldanskii ◽  
D.E. Makarov
Keyword(s):  
Low Temperature ◽  
Quantum Dynamics ◽  
Low Temperature Chemistry

RELAXATION OF METASTABLE STATES BY QUANTUM FLUCTUATION

1999 ◽  
Vol 10 (08) ◽  
pp. 1419-1425
Author(s):  
S. MIYASHITA ◽  
K. SAITO
Keyword(s):  
Low Temperature ◽  
Numerical Method ◽  
Quantum Dynamics ◽  
Resonant Tunneling ◽  
Quantum Fluctuation ◽  
Metastable States ◽  
Magnetization Process ◽  
Tunneling Phenomena ◽  
Nonadiabatic Transitions ◽  
Dissipative Environments

An investigation for numerical method to study quantum dynamics in dissipative environments is presented, studying the resonant tunneling phenomena of the low temperature magnetization process of Mn 12. It is pointed out that information of pure quantum transition can be obtained from deceptive nonadiabatic transitions due to the dissipative environments.

scholarly journals Quantum dynamics under coherent and incoherent effects of a spin bath in the Keldysh formalism: application to a spin swapping operation

2005 ◽  
Vol 402 (1-3) ◽  
pp. 88-95 ◽  
Author(s):  
Ernesto P. Danieli ◽  
Horacio M. Pastawski ◽  
Gonzalo A. Álvarez
Keyword(s):  
Quantum Dynamics ◽  
Spin Bath

scholarly journals DECOHERENCE OF A QUANTUM MEMORY COUPLED TO A COLLECTIVE SPIN BATH

2010 ◽  
Vol 08 (01n02) ◽  
pp. 271-294 ◽  
Author(s):  
RICHARD WALTERS ◽  
STEPHEN R. CLARK ◽  
DIETER JAKSCH
Keyword(s):  
Magnetic Field ◽  
Solid State ◽  
Quantum Dynamics ◽  
Large Range ◽  
Large Degree ◽  
Transverse Magnetic ◽  
Coupling Term ◽  
Single Qubit ◽  
Spin Bath ◽  
Type Coupling

We study the quantum dynamics of a single qubit coupled to a bath of interacting spins as a model for decoherence in solid state quantum memories. The spin bath is described by the Lipkin-Meshkov-Glick model and the bath spins are subjected to a transverse magnetic field. We investigate the qubit interacting via either an Ising- or an XY-type coupling term to subsets of bath spins of differing size. The large degree of symmetry of the bath allows us to find parameter regimes where the initial qubit state is revived at well-defined times after the qubit preparation. These times may become independent of the bath size for large baths and thus enable faithful qubit storage even in the presence of strong coupling to a bath. We analyze a large range of parameters and identify those which are best suited for quantum memories. In general we find that a small number of links between qubit and bath spins leads to less decoherence and that systems with Ising coupling between qubit and bath spins are preferable.

Calculation of the anisotropic magnetoresistance in the electron gas

2015 ◽  
Vol 29 (34) ◽  
pp. 1550230
Author(s):  
J. Azizi
Keyword(s):  
Boltzmann Equation ◽  
Low Temperature ◽  
Electron Scattering ◽  
Coupling Strength ◽  
Electron Gas ◽  
Orbit Coupling ◽  
Anisotropic Magnetoresistance ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Potential Approximation

In this paper, the anisotropic magnetoresistance (AMR) and electron conductivity of electron gas in presence of the Rashba and Dresselhaus spin-orbit coupling are investigated. Boltzmann equation is solved exactly for low temperature, including electron scattering. Calculations have been performed within the coherent potential approximation. Results of the transport study demonstrate that the AMR enhances as the Rashba strength increases. It is also observed that the AMR depends critically on spin-orbit coupling strength, wave vector and Dresselhaus strength.

scholarly journals Controlling the quantum dynamics of a mesoscopic spin bath in diamond

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Gijs de Lange ◽  
Toeno van der Sar ◽  
Machiel Blok ◽  
Zhi-Hui Wang ◽  
Viatcheslav Dobrovitski ◽  
...  
Keyword(s):  
Quantum Dynamics ◽  
Spin Bath
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