Creating heralded hyper-entangled photons using Rydberg atoms

Ghosh, Sutapa; Rivera, Nicholas; Eisenstein, G.; Kaminer, Ido

doi:10.1038/s41377-021-00537-2

Cited by 4 publications

(2 citation statements)

References 76 publications

(72 reference statements)

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“…One particular direction being explored focuses on creating a qubit that can be addressed individually. In this approach a single superatom is used to ensure that, at most, one excitation can be produced in the system and preventing the accidental excitation of a secondary qubit [101][102][103][104][105]. The cavity enhances the superatom-photon coupling which, together with the collective enhancement due to the blockade, allows coherent control and faithful measurement of the superatom qubit [102,103].…”

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confidence: 99%

Quantum optics with Rydberg superatoms

et al. 2023

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Quantum optics based on highly excited atoms, also known as Rydberg atoms, has cemented itself as a powerful platform for the manipulation of light at the few-photon level. The Rydberg blockade, resulting from the strong interaction between individual Rydberg atoms, can turn a large ensemble of atoms into a system which collectively resembles a single two-level emitter, a so-called Rydberg superatom. The coupling of this artificial emitter to a driving photonic mode is collectively enhanced by Rydberg interactions, enabling strong coherent coupling at the few-photon level in free-space. The exquisite level of control achievable through this has already demonstrated its utility in applications of quantum computing and information processing. Here, we review the derivation of the collective coupling between a Rydberg superatom and a single light mode and discuss the similarity of this free-space setup to waveguide quantum electrodynamics systems of quantum emitters coupled to photonic waveguides. We also briefly review applications of Rydberg superatoms to quantum optics such as single-photon generation and single-photon subtraction.

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confidence: 99%

Quantum optics with Rydberg superatoms

et al. 2023

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“…Following publication of this article 1 , it is noticed the Fig. 2 contained an error: three of the curves were cut.…”

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Correction to: Creating heralded hyper-entangled photons using Rydberg atoms

et al. 2021

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Modeling quantum optical phenomena using transition currents

Karnieli,

Rivera,

Di Giulio

et al. 2024

Applied Physics Reviews

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Spontaneous light emission is central to a vast range of physical systems and is a founding pillar for the theory of light–matter interactions. In the presence of complex photonic media, the description of spontaneous light emission usually requires advanced theoretical quantum optics tools such as macroscopic quantum electrodynamics, involving quantized electromagnetic fields. Although rigorous and comprehensive, the complexity of such models can obscure the intuitive understanding of many quantum-optical phenomena. Here, we review a method for calculating spontaneous emission and other quantum-optical processes without making explicit use of quantized electromagnetic fields. Instead, we introduce the concept of transition currents, comprising charges in matter that undergo transitions between initial and final quantum states. We show how predictions that usually demand advanced methods in quantum electrodynamics or quantum optics can be reproduced by feeding these transition currents as sources to the classical Maxwell equations. One then obtains the relevant quantum observables from the resulting classical field amplitudes, without washing out quantum optical effects. We show that this procedure allows for a straightforward description of quantum phenomena, even when going beyond the dipole approximation and single emitters. As illustrative examples, we calculate emission patterns and Purcell-enhanced emission rates in both bound-electron and free-electron systems. For the latter, we derive cathodoluminescence emission and energy-loss probabilities of free electrons interacting with nanostructured samples. In addition, we calculate quantum-beat phenomena in bound-electron systems and wave function-dependent optical coherence in free-electron systems. Remarkably, the transition-current formalism captures more complex phenomena, such as many-body interference effects and super-radiance of both bound- and free-electron systems, second-order processes such as two-photon emission, and quantum recoil corrections to free-electron radiation. We review a variety of light–matter interactions in fields ranging from electron microscopy to nanophotonics and quantum optics, for which the transition-current theoretical formalism facilitates practical simulations and a deeper understanding of novel applications.

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Creating heralded hyper-entangled photons using Rydberg atoms

Cited by 4 publications

References 76 publications

Quantum optics with Rydberg superatoms

Quantum optics with Rydberg superatoms

Correction to: Creating heralded hyper-entangled photons using Rydberg atoms

Modeling quantum optical phenomena using transition currents

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