27,261 research outputs found
Quantum state preparation for coupled period tripling oscillators
We investigate the quantum transition to a correlated state of coupled
oscillators in the regime where they display period tripling in response to a
drive at triple the eigenfrequency. Correlations are formed between the
discrete oscillation phases of individual oscillators. The evolution toward the
ordered state is accompanied by the transient breaking of the symmetry between
seemingly equivalent configurations. We attribute this to the nontrivial
geometric phase that characterizes period tripling. We also show that the
Wigner distribution of a single damped quantum oscillator can display a minimum
at the classically stable zero-amplitude state.Comment: 7 pages, 9 figure
The effect of noise on the dynamics of a complex map at the period-tripling accumulation point
As shown recently (O.B.Isaeva et al., Phys.Rev E64, 055201), the phenomena
intrinsic to dynamics of complex analytic maps under appropriate conditions may
occur in physical systems. We study scaling regularities associated with the
effect of additive noise upon the period-tripling bifurcation cascade
generalizing the renormalization group approach of Crutchfield et al.
(Phys.Rev.Lett., 46, 933) and Shraiman et al. (Phys.Rev.Lett., 46, 935),
originally developed for the period doubling transition to chaos in the
presence of noise. The universal constant determining the rescaling rule for
the intensity of the noise in period-tripling is found to be
Numerical evidence of the expected scaling is
demonstrated.Comment: 9 pages, 4 figure
Broadband passive InP membrane regenerator for silicon-based optical interconnect applications
Improved passive signal regeneration performance based on bonded InP membrane waveguides is demonstrated. A tripling of the ER and receiver sensitivity enhancement of >3.6dB is achieved over the entire C-band at a bitrate of 2.5Gb/
InP membrane based broadband regenerator for silicon-based optical interconnect applications
We demonstrate the use of a Membrane-InP-Switch(MIPS) on-silicon as a signal regenerator. A receiver sensitivity enhancement >2.5dB across the entire C-band and a tripling of Extinction Ratio(ER) for low ER signals at 1Gb/sec is demonstrated
Period-tripling subharmonic oscillations in a driven superconducting resonator
We have observed period-tripling subharmonic oscillations, in a
superconducting coplanar waveguide resonator operated in the quantum regime,
. The resonator is terminated by a tunable inductance
that provides a Kerr-type nonlinearity. We detected the output field
quadratures at frequencies near the fundamental mode, GHz, when the resonator was driven by a current at with an
amplitude exceeding an instability threshold. The output radiation was
red-detuned from the fundamental mode. We observed three stable radiative
states with equal amplitudes and phase-shifted by . The
downconversion from to is strongly enhanced by resonant
excitation of the second mode of the resonator, and the cross-Kerr effect. Our
experimental results are in quantitative agreement with a model for the driven
dynamics of two coupled modes
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