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Search Results: 1 - 10 of 512893 matches for " A. I. Lvovsky "
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Iterative maximum-likelihood reconstruction in quantum homodyne tomography
A. I. Lvovsky
Physics , 2003, DOI: 10.1088/1464-4266/6/6/014
Abstract: I propose an iterative expectation maximization algorithm for reconstructing a quantum optical ensemble from a set of balanced homodyne measurements performed on an optical state. The algorithm applies directly to the acquired data, bypassing the intermediate step of calculating marginal distributions. The advantages of the new method are made manifest by comparing it with the traditional inverse Radon transformation technique.
Squeezed light
A. I. Lvovsky
Physics , 2014,
Abstract: The squeezed state of the electromagnetic field can be generated in many nonlinear optical processes and finds a wide range of applications in quantum information processing and quantum metrology. This article reviews the basic properties of single-and dual-mode squeezed light states, methods of their preparation and detection, as well as their quantum technology applications.
Quantum-optical catalysis: generating "Schroedinger kittens" by means of linear optics
A. I. Lvovsky,J. Mlynek
Physics , 2002, DOI: 10.1103/PhysRevLett.88.250401
Abstract: We report preparation and characterization of coherent superposition states t |0> + alpha |1> of electromagnetic field by conditional measurements on a beamsplitter. The state is generated in one of the beam splitter output channels if a coherent state and a single-photon Fock state |1> are present in the two input ports and a single photon is registered in the other beam splitter output. The single photon thus plays a role of a "catalyst": it is explicitly present in both the input and the output channels of the interaction yet facilitates generation of a nonclassical state of light.
Synthesis and tomographic characterization of the displaced Fock state of light
A. I. Lvovsky,S. A. Babichev
Physics , 2002, DOI: 10.1103/PhysRevA.66.011801
Abstract: Displaced Fock states of the electromagnetic field have been synthesized by overlapping the pulsed optical single-photon Fock state |1> with coherent states on a high-reflection beamsplitter and completely characterized by means of quantum homodyne tomography. The reconstruction reveals highly non-classical properties of displaced Fock states, such as negativity of the Wigner function and photon number oscillations. This is the first time complete tomographic reconstruction has been performed on a highly non-classical optical state.
Multimode electromagnetically-induced transparency on a single atomic line
Geoff Campbell,Anna Ordog,A. I. Lvovsky
Physics , 2009, DOI: 10.1088/1367-2630/11/10/103021
Abstract: We experimentally investigate electromagnetically-induced transparency (EIT) created on an inhomogeneously broadened 5S_1/2-5P_1/2 transition in rubidium vapor using a control field of a complex temporal shape. A comb-shaped transparency spectrum enhances the delay-bandwidth product and the light storage capacity for a matched probe pulse by a factor of about 50 compared to a single EIT line [D. D. Yavuz, Phys. Rev. A 75, 031801 (2007)]. If the temporal mode of the control field is slowly changed while the probe is propagating through the EIT medium, the probe will adiabatically follow, providing a means to perform frequency conversion and optical routing.
Linear-optical processing cannot increase photon efficiency
D. W. Berry,A. I. Lvovsky
Physics , 2010, DOI: 10.1103/PhysRevLett.105.203601
Abstract: We answer the question whether linear-optical processing of the states produced by one or multiple imperfect single-photon sources can improve the single-photon fidelity. This processing can include arbitrary interferometers, coherent states, feedforward, and conditioning on results of detections. We show that without introducing multiphoton components, the single-photon fraction in any of the single-mode states resulting from such processing cannot be made to exceed the efficiency of the best available photon source. If multiphoton components are allowed, the single-photon fidelity cannot be increased beyond 1/2. We propose a natural general definition of the quantum-optical state efficiency, and show that it cannot increase under linear-optical processing.
Preparation and probing of the ground state coherence in Rubidium
Martin Oberst,Frank Vewinger,A. I. Lvovsky
Physics , 2007, DOI: 10.1364/OL.32.001755
Abstract: We demonstrate the preparation and probing of the coherence between the hyperfine ground states |5S_{1/2}, F=1> and |5S_{1/2}, F=2> of the Rubidium 87 isotope. The effect of various coherence control techniques, i.e. fractional Stimulated Raman Adiabatic Passage and Coherent Population Return on the coherence are investigated. These techniques are implemented using nearly degenerate pump and Stokes lasers at 795nm (Rubidium D1 transition) which couple the two hyperfine ground states via the excited state |5P_{1/2}, F=1> through a resonant two-photon process, in which a coherent superposition of the two hyperfine ground states is established. The medium is probed by an additional weak laser, which generates a four-wave mixing signal proportional to the ground state coherence, and allows us to monitor its evolution in time. The experimental data are compared with numerical simulations.
Matched Slow Pulses Using Double Electromagnetically Induced Transparency
Andrew MacRae,Geoff Campbell,A. I. Lvovsky
Physics , 2008, DOI: 10.1364/OL.33.002659
Abstract: We implement double electromagnetically-induced transparency (double EIT) in rubidium vapor, using a tripod-shaped energy level scheme consisting of hyperfine and magnetic sublevels of the 5S1/2 to 5P1/2 transition. We show experimentally that through the use of double EIT one can control the contrast of transparency windows as well as group velocities of the two signal fields. In particular, the group velocities can be equalized, which holds promise to greatly enhance nonlinear optical interaction between these fields.
A Monolithic Filter Cavity for Experiments in Quantum Optics
Pantita Palittapongarnpim,Andrew MacRae,A. I. Lvovsky
Physics , 2012, DOI: 10.1063/1.4726458
Abstract: By applying a high-reflectivity dielectric coating on both sides of a commercial plano-convex lens, we produce a stable monolithic Fabry-Perot cavity suitable for use as a narrow band filter in quantum optics experiments. The resonant frequency is selected by means of thermal expansion. Owing to the long term mechanical stability, no optical locking techniques are required. We characterize the cavity performance as an optical filter, obtaining a 45 dB suppression of unwanted modes while maintaining a transmission of 60%.
Experimental Vacuum Squeezing in Rubidium Vapor via Self-Rotation
J. Ries,B. Brezger,A. I. Lvovsky
Physics , 2003, DOI: 10.1103/PhysRevA.68.025801
Abstract: We report the generation of optical squeezed vacuum states by means of polarization self-rotation in rubidium vapor following a proposal by Matsko et al. [Phys. Rev. A 66, 043815 (2002)]. The experimental setup, involving in essence just a diode laser and a heated rubidium gas cell, is simple and easily scalable. A squeezing of 0.85+-0.05 dB was achieved.
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