Elizabeth A. Goldschmidt
National Institute of Standards and Technology
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Featured researches published by Elizabeth A. Goldschmidt.
Physical Review Letters | 2016
Elizabeth A. Goldschmidt; Thomas Boulier; Roger C. Brown; Silvio B. Koller; Jeremy T. Young; Alexey V. Gorshkov; S L. Rolston; J. V. Porto
We observe interaction-induced broadening of the two-photon 5s-18s transition in ^{87}Rb atoms trapped in a 3D optical lattice. The measured linewidth increases by nearly 2 orders of magnitude with increasing atomic density and excitation strength, with corresponding suppression of resonant scattering and enhancement of off-resonant scattering. We attribute the increased linewidth to resonant dipole-dipole interactions of 18s atoms with blackbody induced population in nearby np states. Over a range of initial atomic densities and excitation strengths, the transition width is described by a single function of the steady-state density of Rydberg atoms, and the observed resonant excitation rate corresponds to that of a two-level system with the measured, rather than natural, linewidth. The broadening mechanism observed here is likely to have negative implications for many proposals with coherently interacting Rydberg atoms.
IEEE Journal of Selected Topics in Quantum Electronics | 2009
Jingyun Fan; Alan L. Migdall; Jun Chen; Elizabeth A. Goldschmidt
In this paper, we review the development of photonic entanglement via four-wave mixing in microstructure fiber.
Physical Review A | 2015
Elizabeth A. Goldschmidt; David Gordon Norris; Silvio B. Koller; Robert Wyllie; Roger C. Brown; J. V. Porto; Safronova; Ulyana I. Safronova
Magic wavelengths, for which there is no differential ac Stark shift for the ground and excited state of the atom, allow trapping of excited Rydberg atoms without broadening the optical transition. This is an important tool for implementing quantum gates and other quantum information protocols with Rydberg atoms, and reliable theoretical methods to find such magic wavelengths are thus extremely useful. We use a high-precision all-order method to calculate magic wavelengths for the 5s−18s transition of rubidium, and compare the calculation to experiment by measuring the light shift for atoms held in an optical dipole trap at a range of wavelengths near a calculated magic value.
Optics Express | 2010
A. J. Pearlman; Alexander Ling; Elizabeth A. Goldschmidt; Christoph F. Wildfeuer; Jingyun Fan; Alan L. Migdall
We experimentally map the transverse profile of diffractionlimited beams using photon-number-resolving detectors.We observe strong compression of diffracted beam profiles for high detected photon number. This effect leads to higher contrast than a conventional irradiance profile between two Airy disk-beams separated by the Rayleigh criterion.
Optics Express | 2013
Elizabeth A. Goldschmidt; Sarah E. Beavan; Sergey V. Polyakov; Alan L. Migdall; Matthew Sellars
Robust, long-lived optical quantum memories are important components of many quantum information and communication protocols. We demonstrate coherent generation, storage, and retrieval of excitations on a long-lived spin transition via spontaneous Raman scattering in a rare-earth ion-doped crystal. We further study the time dynamics of the optical correlations in this system. This is the first demonstration of its kind in a solid and an enabling step toward realizing a solid-state quantum repeater.
Physical Review X | 2017
Olivier Gazzano; Tim Thomay; Elizabeth A. Goldschmidt; Sergey V. Polyakov; Vivien Loo; Glenn S. Solomon
As single-photon sources become more mature and are used more often in quantum information, communications and measurement applications, their characterization becomes more important. Single-photon-like light is often characterized by its brightness, and two quantum properties: the single-photon composition and the photon indistinguishability. While it is desirable to obtain these quantities from a single measurement, currently two or more measurements are required. Here, we simultaneously determine the brightness, the single photon purity, the indistinguishability, and the statistical distribution of Fock states to third order for a quantum light source. The measurement uses a pair of two-photon (n = 2) number-resolving detectors. n > 2 number-resolving detectors provide no additional advantage in the single-photon characterization. The new method extracts more information per experimental trial than a conventional measurement for all input states, and is particularly more e cient for statistical mixtures of photon states. Thus, using this n=2, number- resolving detector scheme will provide advantages in a variety of quantum optics measurements and systems.
Physical Review A | 2017
Sunil Mittal; Venkata Vikram Orre; Alessandro Restelli; Reza Salem; Elizabeth A. Goldschmidt; Mohammad Hafezi
A common challenge in quantum information processing with photons is the limited ability to manipulate and measure correlated states. An example is the inability to measure picosecond-scale temporal correlations of a multiphoton state, given state-of-the-art detectors have a temporal resolution of about 100 ps. Here, we demonstrate temporal magnification of time-bin-entangled two-photon states using a time lens and measure their temporal correlation function, which is otherwise not accessible because of the limited temporal resolution of single-photon detectors. Furthermore, we show that the time lens maps temporal correlations of photons to frequency correlations and could be used to manipulate frequency-bin-entangled photons. This demonstration opens a new avenue to manipulate and analyze spectral and temporal wave functions of many-photon states.
Proceedings of SPIE | 2013
Fabrizio Piacentini; Elizabeth A. Goldschmidt; Maria Griselda Mingolla; I. P. Degiovanni; M. Gramegna; I. R. Berchera; Sergey V. Polyakov; S. Peters; S. Kück; Emanuele Taralli; Lapo Lolli; Mauro Rajteri; Matteo G. A. Paris; Alan L. Migdall; Giorgio Brida; Marco Genovese
We present some Quantum Tomography related results recently obtained in the Quantum Optics labs of the National Institute of Metrological Research (INRIM). Initially we describe the first experimental implementation of a new protocol for the reconstruction of a photon-number-resolving (PNR) detector’s POVM (Positive Operator-Valued Measure): such a protocol, exploiting the strong quantum correlations of an ancillary state, results more robust and efficient than its classical counterparts. The second part of the paper focuses on the quantum characterization of a transition-edge sensor (TES) based PNR detector, i.e. the experimental tomography of the POVM of a TES, with a method based on a quorum of coherent probes: we show the reconstruction of the POVM elements up to 11 detected photons and 100 incoming photons, demonstrating the linearity of such a device. Finally, we present a method for the experimental reconstruction of the modal structure of multimode optical fields exploiting a single measurement of higher-order photon number autocorrelation functions. We show our reconstructions of up to three different modes per optical state, demonstrating the excellent agreement with the theoretical predictions and the robustness of our method itself.
conference on lasers and electro optics | 2008
M. D. Eisaman; Elizabeth A. Goldschmidt; Jingyun Fan; Alan L. Migdall
We test local realistic and non-local realistic theories using a fiber-based source of polarization-entangled photons. Our measurements violate local (certain non-local) hidden-variable theories by 15 (Leggett, A.) standard deviations.
Physical Review A | 2017
I. A. Burenkov; A. K. Sharma; Thomas Gerrits; Georg Harder; Tim J. Bartley; Christine Silberhorn; Elizabeth A. Goldschmidt; Sergey V. Polyakov
We present a method to reconstruct the complete statistical mode structure and optical losses of multimode conjugated optical fields using an experimentally measured joint photon-number probability distribution. We demonstrate that this method evaluates classical and non-classical properties using a single measurement technique and is well-suited for quantum mesoscopic state characterization. We obtain a nearly-perfect reconstruction of a field comprised of up to 10 modes based on a minimal set of assumptions. To show the utility of this method, we use it to reconstruct the mode structure of an unknown bright parametric down-conversion source.