In a paper published today (Sept. 18) in Nature Communications, researchers from the Paul-Drude-Institut in Berlin, Germany, and the Instituto Balseiro in Bariloche, Argentina, demonstrated that the mixing of confined quantum fluids of light and GHz sound leads to the emergence of an elusive phonoriton quasi-particle—in part a quantum of light (photon), a quantum of sound (phonon) and a semiconductor exciton. This discovery opens a novel way to coherently convert information between optical and microwave domains, bringing potential benefits to the fields of photonics, optomechanics and optical communication technologies.
In a paper published today in, researchers from the Paul-Drude-Institut in Berlin, Germany, and the Instituto Balseiro in Bariloche, Argentina, demonstrated that the mixing of confined quantum fluids of light and GHz sound leads to the emergence of an elusive phonoriton quasi-particle—in part a quantum of light , a quantum of sound and a semiconductor exciton.
In the above example, the two pendulums are assumed to have the same frequency, i.e., in resonance. However, hybrid quantum systems require coherent information transfer between oscillators with largely dissimilar frequencies. Here, one important example is in networks of quantum computers. While the most promising quantum computers operate with microwave qubits , quantum information is efficiently transferred using near infrared photons .
Due to stringent experimental requirements for phonoriton emergence, however, there have been very few reports on phonoriton formation. In addition to the scientific importance of the discovery of this novel fundamental semiconductor excitation, the phonoriton can be a new promising intermediary for the coherent microwave-to-optical frequency conversion.
By optically injecting more polaritons into the trap, the team created two polariton condensates, which are characterized by a very bright and spectrally narrow emission line. Unlike conventional lasers, polaritons have strong interparticle interactions, warranting the name"quantum fluids" of light. Due to these interactions, the energy splitting between the two light fluids can be precisely tuned by controlling their densities using an external laser.
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