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Conditional preparation is a well-established technique for quantum stateengineering of light. A general trend is to increase the number of heraldingdetection events in such realization to reach larger photon-number states ortheir arbitrary superpositions. In contrast to pulsed implementations, wheredetections only occur within the pulse window, for continuous-wave light thetemporal separation of the conditioning detections is an additional degree offreedom and a critical parameter. Based on the theoretical study by A.E.B.Nielsen and K. Molmer and on a continuous-wave two-mode squeezed vacuum from anondegenerate optical parametric oscillator, we experimentally investigate thegeneration of two-photon state with tunable delay between the heralding events.The present work illustrates the temporal multimode features in play forconditional state generation based on continuous-wave light sources.

Experimental quantum state engineering with time-separated heraldings from a continuous-wave light source: a temporal-mode analysis