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We introduce a multi-step protocol for optical quantum state engineering thatperforms as deterministic "bright quantum scissors" (BQS), namely truncates anarbitrary input quantum state to have at least a certain number of photons. Theprotocol exploits single-photon pulses and is based on the effect ofsingle-photon Raman interaction, which is implemented with a single three-level$\Lambda$ system (e.g. a single atom) Purcell-enhanced by a single-sidedcavity. A single step of the protocol realises the inverse of the bosonicannihilation operator. Multiple iterations of the protocol can be used todeterministically generate a chain of single-photons in a W state.Alternatively, upon appropriate heralding, the protocol can be used to generateFock-state optical pulses. This protocol could serve as a useful and versatilebuilding block for the generation of advanced optical quantum states that arevital for quantum communication, distributed quantum information processing,and all-optical quantum computing.

Generation of optical Fock and W states with single-atom-based bright quantum scissors