Category Archive: Quantum Optics

Generating nonclassical states from hybrid systems

How to generate a nonclassical continuous-variable (CV) state by making measurements on the discrete-variable (DV) part of a compound CV-DV system? Find out in our latest PRL paper…

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Optical Kerr effect with less than one photon

We emulated the self-phase modulation typical of strong optical Kerr nonlinearity on coherent light pulses containing less than a single photon (on average). These results just appeared in PRL.

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Quantum tomography of homodyne detectors

      We suggest and experimentally demonstrate a tomographic method to characterize homodyne detectors at the quantum level. Our results have just appeared in New Journal of Physics.

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A “plug and play” fiber setup for squeezed light

We demonstrate the first all-guided-wave squeezing experiment at telecom wavelengths. The results from this French-Italian collaboration just appeared in Optica and were highlighted in Optics & Photonics News.  

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A “Schrödinger’s pet” machine

Our machine for turning any input quantum state into a coherent superposition has just appeared on PRL.

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A photon with no area

The recent results from the Italian-Brazilian collaboration on the generation of zero-area single-photon pulses have just appeared on PRL and have been highlighted in Physics.

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Larger noiseless amplification

Different combinations of the photon addition and subtraction operators can be effective in noiselessly amplifying coherent states of light with larger amplitudes.

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Arbitrary state orthogonalizer and qubit generator

We have provided the first demonstration of a general orthogonalization procedure that, starting from an arbitrary continuous-variable quantum state and from limited information about the state itself, can generate an orthogonal state and arbitrary coherent superpositions of the two.

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Making of a zero-area single photon pulse

We just realized the first single-photon version of a zero-area ultrashort pulse.

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Hybrid entanglement of light

We produced entanglement between differently-encoded photonic qubits. A single-photon-based qubit state on one side and a coherent-state-based one on the other. The situation closely resembles the quantum-classical hybrid entanglement of the atom-cat system in the Schroedinger’s cat paradox. Nature Photonics made a cover out of the story (and of our image).

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