EPJ Quantum Technol. (2015) 2: 15
https://doi.org/10.1140/epjqt/s40507-015-0027-z

Research

Generating nonclassical quantum input field states with modulating filters

¹ Department of Physics, Aberystwyth University, Aberystwyth, Wales, SY23 2BZ, UK
² Department of Applied Mathematics, The Hong Kong Polytechnic University, Hong Kong, ACT, 0200, China

^* e-mail: jug@aber.ac.uk

Received: 14 January 2015
Accepted: 1 June 2015
Published online: 19 June 2015

Abstract

We give explicit constructions of quantum dynamical filters which generate nonclassical states (coherent states, cat states, shaped single and multi-photon states) of quantum optical fields as inputs to general quantum Markov systems. The filters will be quantum harmonic oscillators damped by the input fields, and we exploit the fact that the cascaded filter and system will have a Lindbladian that is naturally Wick-ordered in the filter modes. In particular the initialization of the modulating filter will determine the signal state generated.