Stark control of plexcitonic states in incoherent quantum systems

Quantum dots placed inside plasmonic nanocavities can be tuned electro-optically, which is relevant to ultrafast switching, entanglement and quantum information. This paper examines how the optical Stark effect can coherently steer plexcitonic (plasmon–exciton) states in two settings: an off-resonant system and a resonantly coupled one.

In the hybrid plasmon–emitter system studied, a quadratic Stark shift of the emitter's degenerate levels leads to vacuum Rabi splitting, tunable photoluminescence and a Stark-induced transparency window. In the resonant case, Stark splitting of a two-level emitter produces path interference between the hybrid states. According to the paper, Stark tuning both reduces decoherence and allows light emission from the emitter to be switched on and off in the visible range, features the authors link to photonic circuits for information processing and quantum computing.

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