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Two photons in an entangled, spatially correlated (anti-correlated) state transmitted through an Anderson disordered lattice maintain their correlation (anti-correlation) but exhibit coincidence-map speckle in the Fourier plane.
We describe our theoretical and experimental results demonstrating two new techniques for manipulating dispersion in quantum interferometry using spectral and spatial properties of optical entanglement. First, we present a novel interferometer design allowing to demonstrate a new effect of simultaneous even- and odd-order spectral dispersion cancellation in a single experiment using entangled photons...
We demonstrate an approach to violating Bell's inequality with the continuous spatial variables of entangled-photon pairs using simple optical components that manipulate the spatial parity of the transverse coordinate in one dimension.
We present quantum key distribution schemes that are symmetric (Alice and Bob receive photons from a central source, and thus may have passive setups) and noise-immune (require no alignment) for both polarization and phase qubits
We propose to use periodically poled lithium niobate crystals (PPLN) as a source of specially engineered entangled photon pairs. We demonstrate the generation of polarization-entangled states using one-dimensional PPLN, and frequency-entangled states using two-dimensional PPLN.
We propose a method of quantum optical coherence tomography (QOCT) that utilizes a nonclassical source of entangled photons (signal and idler). By using type-II spontaneous parametric downconversion, where signal and idler photons emerge with orthogonal polarizations, it is possible to probe the biological sample using a polarization-entangled state.
Summary form only given. We have experimentally demonstrated that the two-photon probability amplitudes of photon pairs generated using spontaneous parametric down conversion from separate nonlinear crystals, under the conditions outlined above, remain independent and cannot be used to engineer more complex quantum states. The spontaneous nature of the down-conversion process prevents pairs of photons...
Summary form only given. A single-mode quantum-phase operator cannot be simultaneously Hermitian and work in an unrestricted Hilbert-space, recently, work on finding the operator corresponding to the relative phase between two harmonic oscillators has been undertaken. In particular we suggested an experimental implementation of a generalization of the relative-phase operator derived by Luis and Sanchez-Soto...
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