173 research outputs found
Entangling nanomechanical oscillators in a ring cavity by feeding squeezed light
A scheme is presented for entangling two separated nanomechanical oscillators
by injecting broad band squeezed vacuum light and laser light into the ring
cavity. We work in the resolved sideband regime. We find that in order to
obtain the maximum entanglement of the two oscillators, the squeezing parameter
of the input light should be about 1. We report significant entanglement over a
very wide range of power levels of the pump and temperatures of the
environment.Comment: 13 pages,5 figure
Reactive-Coupling-Induced Normal Mode Splittings in Microdisk Resonators Coupled to Waveguides
We study the optomechanical design introduced by M. Li et al. [Phys. Rev.
Lett. {\bf 103}, 223901 (2009)], which is very effective for investigation of
the effects of reactive coupling. We show the normal mode splitting which is
due solely to reactive coupling rather than due to dispersive coupling. We
suggest feeding the waveguide with a pump field along with a probe field and
scanning the output probe for evidence of reactive-coupling-induced normal mode
splitting.Comment: 4 pages,6 figure
Electromagnetically Induced Transparency from Two Phonon Processes in Quadratically Coupled Membranes
We describe how electromagnetically induced transparency can arise in
quadratically coupled optomechanical systems. Due to quadratic coupling the
underlying optical process involves a two phonon process in optomechanical
system and this two phonon process makes the mean amplitude, which plays the
role of atomic coherence in traditional EIT, zero. We show how the fluctuation
in displacement can play a role similar to atomic coherence and can lead to
EIT-like effects in quadratically coupled optomechanical systems. We show how
such effects can be studied using the existing optomechanical systems.Comment: 5 pages,4 figure
Can reactive coupling beat motional quantum limit of nano waveguides coupled to microdisk resonator
Dissipation is generally thought to affect the quantum nature of the system
in an adverse manner, however we show that dissipatively coupled nano systems
can be prepared in states which beat the standard quantum limit of the
mechanical motion. We show that the reactive coupling between the waveguide and
the microdisk resonator can generate the squeezing of the waveguide by
injecting a quantum field and laser into the resonator through the waveguide.
The waveguide can show about 70--75% of maximal squeezing for temperature about
1--10 mK. The maximum squeezing can be achieved with incident pump power of
only 12 W for a temperature of about 1 mK. Even for temperatures of 20 mK,
achievable by dilution refrigerators, the maximum squeezing is about 60%.Comment: 6 pages,2 figure
The Electromagnetically Induced Transparency in Mechanical Effects of Light
We consider the dynamical behavior of a nanomechanical mirror in a
high-quality cavity under the action of a coupling laser and a probe laser. We
demonstrate the existence of the analog of electromagnetically induced
transparency (EIT) in the output field at the probe frequency. Our calculations
show explicitly the origin of EIT-like dips as well as the characteristic
changes in dispersion from anomalous to normal in the range where EIT dips
occur. Remarkably the pump-probe response for the opto mechanical system shares
all the features of the Lambda system as discovered by Harris and
collaborators.Comment: 4 pages, 5 figure
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