72 research outputs found
Quantum Computation as a Dynamical Process
In this paper, we discuss the dynamical issues of quantum computation. We
demonstrate that fast wave function oscillations can affect the performance of
Shor's quantum algorithm by destroying required quantum interference. We also
show that this destructive effect can be routinely avoided by using
resonant-pulse techniques. We discuss the dynamics of resonant pulse
implementations of quantum logic gates in Ising spin systems. We also discuss
the influence of non-resonant excitations. We calculate the range of parameters
where undesirable non-resonant effects can be minimized. Finally, we describe
the ``-method'' which avoids the detrimental deflection of non-resonant
qubits.Comment: 13 pages, 1 column, no figure
Reduction of Magnetic Noise in Magnetic Resonance Force Microscopy
We study the opportunity to reduce a magnetic noise produced by a uniform
cantilever with a ferromagnetic particle in magnetic resonance force microscopy
(MRFM) applications. We demonstrate theoretically a significant reduction of
magnetic noise and the corresponding increase of the MRFM relaxation time using
a nonuniform cantilever
Regular and Random Magnetic Resonance Force Microscopy Signal with a Cantilever Oscillating Parallel to a Sample Surface
We study theoretically the magnetic resonance force microscopy (MRFM) in
oscillating cantilever-driven adiabatic reversals (OSCAR) technique, for the
case when the cantilever tip oscillates parallel to the surface of a sample.
The main contribution to the MRFM signal is associated with a part of the
resonance slice near the surface of the sample. The regular (approximately
exponential) decay of the MRFM signal is followed by the non-dissipating random
signal. The Fourier spectrum of the random signal has a characteristic peak
which can be used for the identification of the signal.Comment: 9 pages, 5 figure
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