scholarly journals Effect of an inhomogeneous external magnetic field on a quantum-dot quantum computer

2001 ◽  
Vol 64 (4) ◽  
Author(s):  
Rogerio de Sousa ◽  
Xuedong Hu ◽  
S. Das Sarma
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Dot ◽  
Quantum Computer

Magnetic Nanoparticles Arrays for Quantum Calculations

2013 ◽  
Vol 718-720 ◽  
pp. 102-106
Author(s):  
Konstantin Nefedev ◽  
Vitalii Kapitan ◽  
Yuriy Shevchenko
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Computer ◽  
Magnetic State ◽  
Quantum Superposition ◽  
Magnetostatic Field ◽  
Magnetic Dipoles ◽  
Ordered Array ◽  
Quantum Phenomena ◽  
Magnetic States

In frames of a quantum computer implementation, the ordered array of magnetic dipoles nanoparticles is considered. The phase space calculated for system of dipoles, which interact through long-range magnetostatic field. The behavior of nanoarchitectures in an external magnetic field is studied. The degeneracy of the equilibrium magnetic states depending on the value of an external magnetic field and the spin excess of configurations are determined. The presence of degeneration is a classical analog of quantum superposition, and distribution of probability of magnetic state is a classical representation of such quantum phenomena as entanglement.

scholarly journals MINIMIZATION OF NONRESONANT EFFECTS IN A SCALABLE ISING SPIN QUANTUM COMPUTER

2004 ◽  
Vol 02 (03) ◽  
pp. 379-392 ◽  
Author(s):  
G. P. BERMAN ◽  
D. I. KAMENEV ◽  
V. I. TSIFRINOVICH
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Quantum Computer ◽  
One Dimensional ◽  
Ising Spin ◽  
Spin Quantum ◽  
Computer Based ◽  
Frequency Offsets ◽  
Optimal Values ◽  
Large Frequency

The errors caused by the transitions with large frequency offsets (nonresonant transitions) are calculated analytically for a scalable solid-state quantum computer based on a one-dimensional spin chain with Ising interactions between neighboring spins. Selective excitations of the spins are enabled by a uniform gradient of the external magnetic field. We calculate the probabilities of all unwanted nonresonant transitions associated with the flip of each spin with nonresonant frequency and with flips of two spins: one with resonant and one with nonresonant frequencies. It is shown that these errors oscillate with changing gradient of the external magnetic field. Choosing the optimal values of this gradient allows us to decrease these errors by 50%.

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