Publications by Alexander Lvovsky


Spatial and temporal characterization of a Bessel beam produced using a conical mirror

QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC) 1110 (2009) 291-+

KB Kuntz, B Braverman, SH Youn, M Lobino, EM Pessina, AI Lvovsky


Generation of Squeezed Vacuum States via Polarization Self-Rotation

QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC) 1110 (2009) 173-176

G Campbell, C Healey, J Appel, K-P Marzlin, AI Lvovsky


Propagation of squeezed vacuum under electromagnetically induced transparency

NEW JOURNAL OF PHYSICS 11 (2009) ARTN 013044

E Figueroa, M Lobino, D Korystov, J Appel, AI Lvovsky


Simultaneous Slow Light Pulses With Matched Group Velocities via Double-EIT

QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC) 1110 (2009) 269-272

A MacRae, G Campbell, A Ordog, AL Lvovsky


Coherent-State Quantum Process Tomography

QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC) 1110 (2009) 447-450

M Lobino, D Korystov, C Kupchak, E Figueroa, BC Sanders, AI Lvovsky


Electromagnetically-induced transparency and squeezed light

QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC) 1110 (2009) 249-+

E Figueroa, J Appel, D Korystov, M Lobino, C Kupchak, AI Lvovsky


Quantum Tomography of the Single-Photon State Generated by Down Conversion in a Periodically Poled KTP Crystal

QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC) 1110 (2009) 201-+

N Jain, S-H Youn, AI Lvovsky


Spatial and temporal characterization of a Bessel beam produced using a conical mirror

PHYSICAL REVIEW A 79 (2009) ARTN 043802

KB Kuntz, B Braverman, SH Youn, M Lobino, EM Pessina, AI Lvovsky


Continuous-variable optical quantum-state tomography

REVIEWS OF MODERN PHYSICS 81 (2009) 299-332

AI Lvovsky, MG Raymer


Photons as quasicharged particles

PHYSICAL REVIEW A 77 (2008) ARTN 043813

K-P Marzlin, J Appel, AI Lvovsky


Complete characterization of quantum-optical processes.

Science (New York, N.Y.) 322 (2008) 563-566

M Lobino, D Korystov, C Kupchak, E Figueroa, BC Sanders, AI Lvovsky

The technologies of quantum information and quantum control are rapidly improving, but full exploitation of their capabilities requires complete characterization and assessment of processes that occur within quantum devices. We present a method for characterizing, with arbitrarily high accuracy, any quantum optical process. Our protocol recovers complete knowledge of the process by studying, via homodyne tomography, its effect on a set of coherent states, that is, classical fields produced by common laser sources. We demonstrate the capability of our protocol by evaluating and experimentally verifying the effect of a test process on squeezed vacuum.


Quantum memory for squeezed light.

Physical review letters 100 (2008) 093602-

J Appel, E Figueroa, D Korystov, M Lobino, AI Lvovsky

We produce a 600-ns pulse of 1.86-dB squeezed vacuum at 795 nm in an optical parametric amplifier and store it in a rubidium vapor cell for 1 mus using electromagnetically induced transparency. The recovered pulse, analyzed using time-domain homodyne tomography, exhibits up to 0.21+/-0.04 dB of squeezing. We identify the factors leading to the degradation of squeezing and investigate the phase evolution of the atomic coherence during the storage interval.


Matched slow pulses using double electromagnetically induced transparency.

Optics letters 33 (2008) 2659-2661

A MacRae, G Campbell, AI Lvovsky

We implement double electromagnetically induced transparency (DEIT) in rubidium vapor using a tripod-shaped energy-level scheme consisting of hyperfine magnetic sublevels of the 5S1/2-->5P1/2 transition. We show experimentally that through the use of DEIT 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.


Diluted maximum-likelihood algorithm for quantum tomography

PHYSICAL REVIEW A 75 (2007) ARTN 042108

J Rehacek, Z Hradil, E Knill, AI Lvovsky


Adiabatic frequency conversion of optical information in atomic vapor.

Optics letters 32 (2007) 2771-2773

F Vewinger, J Appel, E Figueroa, AI Lvovsky

We experimentally demonstrate a communication protocol that enables frequency conversion and routing of quantum information in an adiabatic and thus robust way. The protocol is based on electromagnetically induced transparency (EIT) in systems with multiple excited levels: transfer and/or distribution of optical states between different signal modes is implemented by adiabatically changing the control fields. The proof-of-principle experiment is performed using the hyperfine levels of the rubidium D1 line.


Time-resolved probing of the ground state coherence in rubidium.

Optics letters 32 (2007) 1755-1757

M Oberst, F Vewinger, AI Lvovsky

We demonstrate the preparation and probing of the coherence between the hyperfine ground states |S(1/2),F=1> and |5S(1/2),F=2> of the Rb87 isotope. The effects 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 795 nm (Rb 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.


Frequency conversion and routing of quantum information in atomic media

SIXTH SYMPOSIUM: OPTICS IN INDUSTRY 6422 (2007) ARTN 64221U

F Vewinger, J Appel, E Figueroa, AI Lvovsky


Decomposing a pulsed optical parametric amplifier into independent squeezers

JOURNAL OF MODERN OPTICS 54 (2007) 721-733

AI Lvovsky, W Wasilewski, K Banaszek


Electronic noise in optical homodyne tomography

PHYSICAL REVIEW A 75 (2007) ARTN 035802

J Appel, D Hoffman, E Figueroa, AI Lvovsky


Efficiency limits for linear optical processing of single photons and single-rail qubits

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 24 (2007) 189-197

DW Berry, AI Lvovsky, BC Sanders

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