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Using spontaneous parametric down-conversion in ppKTP waveguides, we probe photon-number correlated states of up to 50 photons with a Klyshko efficiency of >60%, in a single mode characterised by an unheralded marginal g(2)(0) = 1.87±0.05.
Using the building blocks of quantum optics — single photons, coherent states, beam splitters and projective measurement — we construct a two-mode quantum state for which coincident photon number terms in each mode are removed.
We present the joint spectral amplitudes for a single and double photon pair from a spectrally factorizable type-II parametric downconversion process and show that the first Schmidt mode of double pair emission equals the square of the first single pair emission Schmidt mode.
A foundation of quantum mechanics is that quantum objects can exhibit both particle-like and wave-like behaviour. Uncovering particular behaviour depends largely on the type of detector used. In an optical setting, photon counting and homodyne detection are typically used to expose particle and wave phenomena, respectively. Recently, weak-field homodyne detection was demonstrated [1], whereby photonic...
Nonclassical states of light are necessary resources for quantum technologies such as cryptography, computation and the definition of metrological standards. Distinguishing nonclassical states from those that can be described without invoking quantum mechanics is both a necessary practical task and of fundamental interest. In general, signatures of nonclassicality arise from apparently pathological...
Entanglement enhancement is a key task for quantum technologies. This operation performed on states produced by parametric down-conversion sources has been the object of several recent experimental investigations. In particular, conditional preparation by photon-subtraction has been shown to improve the entanglement of these states. Here we analyse the role played by non-Gaussian and Gaussian measurements...
We demonstrate a method to transmute classical light into a quantum state without invoking any nonlinear optical processes. Using a tunable beam splitter and photon number resolving measurement, we create a novel non-Gaussian state.
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