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We describe a mode-selective single-photon subtraction device based on sum-frequency generation and ultrafast pulse shaping for multimode quantum state engineering. Its essential feature is the tunability of the single-photon subtraction mode.
A real time, spectrally resolved detection system is developed to characterize the time/frequency modes of an optical frequency comb. Covariance matrix approached is used both for laser dynamics study and quantum metrology experiments.
Multimode squeezed states are used to enhance the measurement of optical frequency fluctuations beyond the standard quantum limit. A multichannel detector is employed, which enables simultaneous extraction of orthogonal parameters characterizing the light field
Photonic cluster states are fabricated within the internal structure of a multimode frequency comb. Projective measurements combined with ultrafast pulse shaping allow the creation of arbitrary cluster states with no change in the optical footprint.
Cluster states, in which entanglement is distributed amongst numerous parties, have attracted interest due to their role as a resource for measurement-based quantum computing [1]. The traditional means for fabricating these highly-entangled states has been to sequentially combine the squeezed outputs from individual optical parametric oscillators (OPO) with a network of phase-shifters and beamsplitters...
Optical techniques are widely used in many areas of science and technology to make accurate measurements. The precision of these measurements suffers from limits due to the unavoidable quantum fluctuations of light. When the light is in the quasi-classical coherent state, this limit is called ”standard quantum limit” and scales as 1/√N with N the number of photons. While better scaling can be achieved...
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