Abstract
Exciton-polaritons are hybrid radiation-matter elementary excitations that, thanks to their strong nonlinearities, enable a plethora of physical phenomena ranging from room temperature condensation to superfluidity. While polaritons are usually exploited in a high-density regime, evidence for quantum correlations at the level of few excitations has been recently reported, thus suggesting the possibility of using these systems for quantum information purposes. Here we show that integrated circuits of propagating single polaritons can be arranged to build deterministic quantum logic gates in which the two-particle interaction energy plays a crucial role. Besides showing their prospective potential for photonic quantum computation, we also show that these systems can be exploited for metrology purposes, as for instance to precisely measure the magnitude of the polariton-polariton interaction at the two-body level. Our results will motivate the development of practical quantum polaritonic devices in prospective quantum technologies.
Highlights
Exciton-polaritons are hybrid radiation-matter elementary excitations that, thanks to their strong nonlinearities, enable a plethora of physical phenomena ranging from room temperature condensation to superfluidity
We show that it is possible to realize nonlinear quantum devices by exploiting polariton-polariton interactions that are naturally present in a quantum polariton integrated circuits (QPIC)
We start by briefly outlining the theoretical model that will be exploited to describe polariton-polariton interactions at the two-particle level in QPICs
Summary
Exciton-polaritons are hybrid radiation-matter elementary excitations that, thanks to their strong nonlinearities, enable a plethora of physical phenomena ranging from room temperature condensation to superfluidity. Triggered by all these promising experimental results, as well as by the thrilling perspective to perform quantum computational tasks by means of polariton-based devices, we have been motivated to provide an in-depth theoretical analysis of integrated polariton circuits in the quantum regime, with particular attention to the differences with respect to linear photonic integrated circuits and to the unique possibilities enabled by nonlinearities introduced by polariton interactions In our view, such quantum polariton integrated circuits (QPIC) can be assumed as complex networks resulting from the combination of n coupled nonlinear waveguides and interferometers, in which polaritons can be injected and propagate while interacting at the level of few quanta
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