Abstract
For many experiments in quantum optics like homodyne detection or heralded state preparation it is essential to learn about the spectral structure of the quantum mechanical states under study [1,2]. Typically, in these experiments the requirement of very low losses imposes the main constraint on the usability of conventional grating spectrometers from classical optics. Furthermore, the high cost of detectors sensitive to single photons-like avalanche photo diodes (APDs)-prohibits the use of detector arrays required in spectrographs. We present an implementation of a fibre integrated spectrograph for characterizing the spectrum of an ultrafast optical pulse at the single photon level [3].
© 2009 IEEE
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