Quantum and optical technology

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

(2006)

Authors:

Dominic W Berry, AI Lvovsky, Barry C Sanders
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On decoherence of electromagnetically-induced transparency in atomic vapor

(2006)

Authors:

E Figueroa, F Vewinger, J Appel, AI Lvovsky
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Decomposing a pulsed optical parametric amplifier into independent squeezers

(2006)

Authors:

AI Lvovsky, W Wasilewski, K Banaszek
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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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