The nature of a quantum network, in particular in the continuous variable regime, is governed not only by the light quantum state but also by the measurement process. It can then be chosen after the light source has been generated. Multimode entanglement is not anymore an intrinsic property of the source but a complex interplay between source, measurement and eventually post processing. This new avenue paves the way for adaptive and scalable quantum information processing. However, to reach this ambitious goal, multimode degaussification has to be implemented.
Single-photon subtraction and addition have proved to be such key operations, but are usually performed with linear optics elements on single-mode resources. We present a device able to perform mode dependant non Gaussian operation on a spectrally multimode squeezed vacuum states. Sum frequency generation between the state and a bright control beam whose spectrum has been engineered through ultrafast pulse-shaping is performed. The detection of a single converted photon heralds the success of the operation.
The resulting multimode quantum state is analysed with standard homodyne detection whose local oscillator spectrum is independently engineered. The device can be characterized through quantum process tomography using weak multimode coherent states as inputs. Its single-mode character can be quantified and its inherent subtraction modes can be measured.
The ability to simultaneously control the state engineering and its detection ensures both flexibility and scalability in the production of highly entangled non-Gaussian quantum states.
We are utilizing control of molecular processes at the quantum level via the best capabilities of recent laser
technology and recent discoveries in optimal shaping of laser pulses to significantly enhance the standoff
detection of explosives. Optimal dynamic detection of explosives (ODD-Ex) is a methodology whereby laser pulses
are optimally shaped to simultaneously enhance the sensitivity and selectivity of any of a wide variety of
spectroscopic methods for explosives signatures while reducing the influence of noise and environmental
perturbations. We discuss here recent results using complementary ODD-Ex methods.
The detection of explosives is a notoriously difficult problem, especially at stand-off distances, due to their (generally)
low vapor pressure, environmental and matrix interferences, and packaging. We are exploring optimal dynamic
detection to exploit the best capabilities of recent advances in laser technology and recent discoveries in optimal shaping
of laser pulses for control of molecular processes to significantly enhance the standoff detection of explosives. The core
of the ODD-Ex technique is the introduction of optimally shaped laser pulses to simultaneously enhance sensitivity of
explosives signatures while reducing the influence of noise and the signals from background interferents in the field
(increase selectivity). These goals are being addressed by operating in an optimal nonlinear fashion, typically with a
single shaped laser pulse inherently containing within it coherently locked control and probe sub-pulses. With sufficient
bandwidth, the technique is capable of intrinsically providing orthogonal broad spectral information for data fusion, all
from a single optimal pulse.
There are many potential applications for MEMS micromirror devices for femtosecond pulse shaping applications. Their
broadband reflectivity gives them an advantage in comparison to devices such as liquid crystal- and acousto-optical modulators
because of the possibility to directly shape UV pulses in the range 250 - 400 nm, and thus address UV-absorbing
molecules. The identification and discrimination of biomolecules which exhibit almost the same spectra has sparked
some interest in the last years as it allows real-time, environmental and optical monitoring. Here, we present the last
developments using the Fraunhofer IPMS MEMS phase former capable of accomplishing such goals.
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