PHYSICS: STUDIES FROM T.V. GEVORGYAN AND COLLEAGUES REVEAL NEW FINDINGS ON PHYSICS

Science Letter
July 21, 2009

According to a study from Armenia, "We show that quantum-interference
phenomena can be realized for the dissipative nonlinear systems
exhibiting hysteresis-cycle behavior and quantum chaos. Such results
are obtained for a driven dissipative nonlinear oscillator with
time-dependent parameters and take place for the regimes of long time
intervals exceeding dissipation time and for macroscopic levels of
oscillatory excitation numbers."

"Two schemas of time modulation, (i) periodic variation in the strength
of the chi(3) nonlinearity; (ii) periodic modulation of the amplitude
of the driving force, are considered. These effects are obtained within
the framework of phase-space quantum distributions. It is demonstrated
that the Wigner functions of oscillatory mode in both bistable and
chaotic regimes acquire negative values and interference patterns
in parts of phase-space due to appropriately time modulation of the
oscillatory nonlinear dynamics," wrote T.V. Gevorgyan and colleagues
(see also Physics).

The researchers concluded: "It is also shown that the time modulation
of the oscillatory parameters essentially improves the degree of
sub-Poissonian statistics of excitation numbers."

Gevorgyan and colleagues published their study in Physical Review a
(Quantum interference and sub-Poissonian statistics for time-modulated
driven dissipative nonlinear oscillators. Physical Review a,
2009;79(5):3828).

For more information, contact T.V. Gevorgyan, National Academy Science,
Institute Physics Research, Ashtarak 2, Ashtarak 0203, Armenia.

Publisher contact information for the journal Physical Review a
is: American Physical Society, One Physics Ellipse, College Pk,
MD 20740-3844, USA.