81,974 research outputs found
Revealing Hidden Vibration Polariton Interactions by 2D IR Spectroscopy
We report the first experimental two-dimensional infrared (2D IR) spectra of
novel molecular photonic excitations - vibrational-polaritons. The application
of advanced 2D IR spectroscopy onto novel vibrational-polariton challenges and
advances our understanding in both fields. From spectroscopy aspect, 2D IR
spectra of polaritons differ drastically from free uncoupled molecules; from
vibrational-polariton aspects, 2D IR uniquely resolves hybrid light-matter
polariton excitations and unexpected dark states in a state-selective manner
and revealed hidden interactions between them. Moreover, 2D IR signals
highlight the role of vibrational anharmonicities in generating non-linear
signals. To further advance our knowledge on 2D IR of vibrational polaritons,
we develop a new quantum-mechanical model incorporating the effects of both
nuclear and electrical anharmonicities on vibrational-polaritons and their 2D
IR signals. This work reveals polariton physics that is difficult or impossible
to probe with traditional linear spectroscopy and lays the foundation for
investigating new non-linear optics and chemistry of molecular
vibrational-polaritons
Spatially Adiabatic Frequency Conversion in Optoelectromechanical Arrays
Faithful conversion of quantum signals between microwave and optical
frequency domains is crucial for building quantum networks based on
superconducting circuits. Optoelectromechanical systems, in which microwave and
optical cavity modes are coupled to a common mechanical oscillator, are a
promising route towards this goal. In these systems, efficient, low-noise
conversion is possible using a mechanically dark mode of the fields but the
conversion bandwidth is limited to a fraction of the cavity linewidth. Here, we
show that an array of optoelectromechanical transducers can overcome this
limitation and reach a bandwidth that is larger than the cavity linewidth. The
coupling rates are varied in space throughout the array so that the
mechanically dark mode of the propagating fields adiabatically changes from
microwave to optical or vice versa. This strategy also leads to significantly
reduced thermal noise with the collective optomechanical cooperativity being
the relevant figure of merit. Finally, we demonstrate that, quite surprisingly,
the bandwidth enhancement per transducer element is largest for small arrays;
this feature makes our scheme particularly attractive for state-of-the-art
experimental setups.Comment: 18 pages, 10 figures (including Supplemental Material
Adiabatic State Conversion and Pulse Transmission in Optomechanical Systems
Optomechanical systems with strong coupling can be a powerful medium for
quantum state engineering. Here, we show that quantum state conversion between
cavity modes with different wavelengths can be realized with high fidelity by
adiabatically varying the effective optomechanical couplings. The fidelity for
the conversion of gaussian states is derived by solving the Langevin equation
in the adiabatic limit. We also show that photon pulses can be transmitted
between input-output channels with different wavelengths via the effective
optomechanical couplings and the output pulse shape can also be manipulated.Comment: 5 pages, 2 figures. Supplementary Materials at
http://prl.aps.org/supplemental/PRL/v108/i15/e15360
Raman Adiabatic Transfer of Optical States
We analyze electromagnetically induced transparency and light storage in an
ensemble of atoms with multiple excited levels (multi-Lambda configuration)
which are coupled to one of the ground states by quantized signal fields and to
the other one via classical control fields. We present a basis transformation
of atomic and optical states which reduces the analysis of the system to that
of EIT in a regular 3-level configuration. We demonstrate the existence of dark
state polaritons and propose a protocol to transfer quantum information from
one optical mode to another by an adiabatic control of the control fields
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