Shamir Rosen

Experimental tomography of NOON states with large photon numbers

We have performed experimental quantum state tomography of NOON states with up to four photons. The measured states are generated by mixing a classical coherent state with spontaneous parametric down-conversion. We show that this method produces states which exhibit a high fidelity with ideal NOON states. The fidelity is limited by the overlap of the two-photon down-conversion state with any two photons originating from the coherent state, for which we introduce and measure a figure of merit. A second limitation on the fidelity set by the total setup transmission is discussed. We also apply the same tomography procedure for characterizing correlated photon hole states.

Sub-Rayleigh lithography using high flux loss-resistant entangled states of light.

Quantum lithography achieves phase superresolution using fragile, experimentally challenging entangled states of light. We propose a scalable scheme for creating features narrower than classically achievable with reduced use of quantum resources and, consequently, enhanced resistance to loss. The scheme is an implementation of interferometric lithography using a mixture of a spontaneous parametric down-converted entangled state with intense classical coherent light. We measure coincidences of up to four photons mimicking multiphoton absorption. The results show a narrowing of the interference fringes of up to 30% with respect to the best analogous classical scheme using only 10% of the nonclassical light required for creating NOON states.

Transient emission of the ‘off’ state of blinking quantum dots is not governed by auger recombination dynamics

Blinking in colloidal nanocrystals is studied through photon counting from single nanocrystals. Size independent ‘off’ state dynamics are observed in contrast to predictions by prevailing models which attribute ‘dark’ states to Auger recombination assisted quenching.

Quantum Imaging Using Entangled States by Mixing Quantum and Classical Light

We show that by mixing quantum spontaneous parametric down-conversion with the classical coherent state we can generate robust narrow features for quantum lithography, and high fidelity NOON states and correlated-photon-holes states.