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Canadian Journal of Physics

Decoherence-free subspaces and spontaneous emission cancellation

Karl-Peter Marzlin, Raisa I. Karasik, Barry C. Sanders, K. Birgitta Whaley

Published Jun 1, 2007• 2 citations
Publisher

Abstract

We establish the connection between decoherence-free subspaces of quantum information and spontaneous emission cancellation in quantum optics with molecules. Both phenomena rely on the destructive interference of transition amplitudes from two initial states to a common target state. We discuss physical similarities, differences, and limitations of both phenomena. PACS Nos.: 03.65.Yz, 42.50.–p, 03.67.Pp

DOI
10.1139/p07-070

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We establish the connection between decoherence-free subspaces of quantum information and spontaneous emission cancellation in quantum optics with molecules. Both phenomena rely on the destructive interference of transition amplitudes from two initial states to a common target state. We discuss physical similarities, differences, and limitations of both phenomena. PACS Nos.: 03.65.Yz, 42.50.–p, 03.67.Pp
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It is well known that the application of a pulse to a molecular electronic transition leaves the molecules vibrational modes in different electronic states in well-localized states, or wave packets[1]. One method of detecting the wave packets is via the time-dependent spectra of spontaneous emission from the excited molecule[2]. The emission consists in general of two parts, an incoherent part that depends only on the wave packet in the excited state, and a coherent part, that depends on the wave packets in both excited and ground electronic states (of a two-state molecule). This can be seen from the following simple calculation.