Quantum and optical technology

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Decoherence of electromagnetically induced transparency in atomic vapor.

Optics letters 31:17 (2006) 2625-2627

Authors:

E Figueroa, F Vewinger, J Appel, AI Lvovsky

Abstract:

We report characterization of electromagnetically induced transparency (EIT) resonances in the D1 line of (87)Rb under various experimental conditions. The dependence of the EIT linewidth on the power of the pump field was investigated at various temperatures for the ground states of the lambda system associated with different hyperfine levels of the atomic 5S(1/2) state as well as magnetic sublevels of the same hyperfine level. Strictly linear behavior was observed in all cases. A theoretical analysis of our results shows that dephasing in the ground state is the main source of decoherence, with population exchange playing a minor role.
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Characterization of atomic coherence decay for the storage of light

Proceedings of SPIE SPIE, the international society for optics and photonics 6305 (2006) 630514-630514-8

Authors:

E Figueroa, F Vewinger, J Appel, G Günter, AI Lvovsky
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Pulsed squeezed light: Simultaneous squeezing of multiple modes

Physical Review A American Physical Society (APS) 73:6 (2006) 063819

Authors:

Wojciech Wasilewski, AI Lvovsky, Konrad Banaszek, Czesław Radzewicz
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Raman adiabatic transfer of optical states in multilevel atoms

Physical Review A American Physical Society (APS) 73:1 (2006) 013804

Authors:

Jürgen Appel, K-P Marzlin, AI Lvovsky
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Interconvertibility of single-rail optical qubits.

Optics letters 31:1 (2006) 107-109

Authors:

Dominic W Berry, AI Lvovsky, Barry C Sanders

Abstract:

We show how to convert between partially coherent superpositions of a single photon with the vacuum by using linear optics and postselection based on homodyne measurements. We introduce a generalized quantum efficiency for such states and show that any conversion that decreases this quantity is possible. We also prove that our scheme is optimal by showing that no linear optical scheme with generalized conditional measurements, and with one single-rail qubit input, can improve the generalized efficiency.
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