Early-time behavior of quantum subharmonic generation

Choi, Yunjin; Hemmerling, Boerge; Tsai, Shan-Wen; Mills, A. P.

doi:10.1103/physreva.103.043518

Cited by 1 publication

(1 citation statement)

References 29 publications

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“…In addition to creating polyelectrons, a long-term goal of Ps physics has been the formation of an ensemble of Ps atoms that are cold or dense enough to create a Bose-Einstein condensate (BEC) [14]. The primary motivation for producing a Ps BEC is that such a system may exhibit the phenomenon of stimulated * s.de-liberato@soton.ac.uk annihilation [15,16], allowing for the creation of a γ -ray laser, but the properties of a Ps BEC are also of interest from a theoretical perspective (see, e.g., [17][18][19][20]). The low mass of Ps means that the transition temperature (that is, the temperature at which a dense ensemble will undergo a phase transition to form a condensate) is considerably higher than it is for all other atoms; for example, room temperature Ps condensates could form at densities on the order of 10 20 cm −3 [21].…”

Section: Introductionmentioning

confidence: 99%

Positronium density measurements using polaritonic effects

Cortese

Cassidy²,

Liberato³

2023

Phys. Rev. A

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Recent experimental advances in positronium (Ps) physics have made it possible to produce dense Ps ensembles in which Ps-Ps interactions may occur, leading to the production of Ps 2 molecules and paving the way to the realization of a Ps Bose-Einstein condensate (BEC). In order to achieve this latter goal it would be advantageous to develop new methods to measure Ps densities in real time. Here we describe a possible approach to do this using polaritonic methods: Using realistic experimental parameters, we demonstrate that a dense Ps gas can be strongly coupled to the photonic field of a distributed Bragg reflector microcavity. In this strongly coupled regime, the optical spectrum of the system is composed of two hybrid positronium-polariton resonances separated by the vacuum Rabi splitting, which is proportional to the square root of the Ps density. Given that polaritons can be created on a subcycle timescale, a spectroscopic measurement of the vacuum Rabi splitting could be used as an ultrafast Ps density measurement in regimes relevant to Ps BEC formation. Moreover, we show how positronium polaritons could potentially enter the ultrastrong light-matter coupling regime, introducing a platform to explore its nonperturbative phenomenology.

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