Volume 86, Number 1, April 2009
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||22 April 2009|
Perfect excitation of a matter qubit by a single photon in free space
Max Planck Institute for the Science of Light - Günter-Scharowsky-Str. 1, Bau 24, 91058 Erlangen, Germany, EU
2 Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg - Staudtstr. 7/B2, 91058 Erlangen, Germany, EU
3 Institut für Angewandte Physik, Technische Universität Darmstadt - 64289 Darmstadt, Germany, EU
Corresponding author: firstname.lastname@example.org
Accepted: 17 March 2009
We propose a scheme for perfect excitation of a single two-level atom by a single photon in free space. The photon state has to match the time reversed photon state originating from spontaneous decay of a two-level system. Here, we discuss its experimental preparation. The state is characterized by a particular asymmetric exponentially shaped temporal profile. Any deviations from this ideal state limit the maximum absorption. Although perfect excitation requires an infinite amount of time, we demonstrate that there is a class of initial one-photon quantum states which can achieve almost perfect absorption even for a finite interaction time. Our results pave the way for realizing perfect coupling between flying and stationary qubits in free space thus opening a possibility for building scalable quantum networks.
PACS: 42.50.Ct – Quantum description of interaction of light and matter; related experiments / 03.67.Lx – Quantum computation architectures and implementations
© EPLA, 2009
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