Spin squeezing by one-photon–two-atom excitation processes in atomic ensembles

Macrì, Vincenzo; Nori, Franco; Savasta, Salvatore; Zueco, David

doi:10.1103/physreva.101.053818

Cited by 31 publications

(21 citation statements)

References 73 publications

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“…It is, in general, very difficult to perform numerical simulations for a large ensemble because the Hilbert space of the ensemble grows as 2 N . In order to reduce the dimension of this Hilbert space, we follow the method in a study by Gelhausen et al [50], Shammah et al [51], and Macrì et al [52] and perform a Fourier transformation,…”

Section: Discussionmentioning

confidence: 99%

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Strong spin squeezing induced by weak squeezing of light inside a cavity

et al. 2020

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We propose a simple method for generating spin squeezing of atomic ensembles in a Floquet cavity subject to a weak, detuned two-photon driving. We demonstrate that the weak squeezing of light inside the cavity can, counterintuitively, induce strong spin squeezing. This is achieved by exploiting the anti-Stokes scattering process of a photon pair interacting with an atom. Specifically, one photon of the photon pair is scattered into the cavity resonance by absorbing partially the energy of the other photon whose remaining energy excites the atom. The scattering, combined with a Floquet sideband, provides an alternative mechanism to implement Heisenberg-limited spin squeezing. Our proposal does not need multiple classical and cavity-photon drivings applied to atoms in ensembles, and therefore its experimental feasibility is greatly improved compared to other cavity-based schemes. As an example, we demonstrate a possible implementation with a superconducting resonator coupled to a nitrogen-vacancy electronic-spin ensemble.

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Section: Discussionmentioning

confidence: 99%

“…k 0 , indicating that the collective spin operators are related only to the zero momentum mode [50][51][52]. Conse-…”

Section: Physical Modelmentioning

confidence: 99%

Strong spin squeezing induced by weak squeezing of light inside a cavity

et al. 2020

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“…It would be interesting and useful for applications to extend these studies to the cases of spatially separated atomic ensembles 86 , and distant qubits coupled to open waveguides 93 . Moreover, further insights on the processes here analysed can be gained by considering two or more spatially separated atoms in a multimode cavity 87 .…”

Section: Discussionmentioning

confidence: 99%

“…One of the most interesting nonlinear optical effects predicted in the USC regime consists of the simultaneously excitation of two or more spatially separated atoms by a single photon 23 , 84 – 86 . This last puzzling result, which has been studied in a quantum system constituted by two qubit ultrastrongly coupled to a single-mode resonator, provides new insights into the various quantum aspects of the interaction between light and matter and can find useful applications for the development of novel quantum technologies.…”

Section: Introductionmentioning

confidence: 99%

Atoms in separated resonators can jointly absorb a single photon

Garziano

Ridolfo

Miranowicz

et al. 2020

Sci Rep

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The coherent nonlinear process where a single photon simultaneously excites two or more two-level systems (qubits) in a single-mode resonator has recently been theoretically predicted. Here we explore the case where the two qubits are placed in different resonators in an array of two or three weakly coupled resonators. Investigating different setups and excitation schemes, we show that this process can still occur with a probability approaching one under specific conditions. The obtained results provide interesting insights into subtle causality issues underlying the simultaneous excitation processes of qubits placed in different resonators.

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“…The experimental progress in USC physics has motivated many theoretical studies showing interesting new effects enabled or boosted by this regime . Several studies explore higher-order processes in the USC regime, where the number of excitations is not conserved [43][44][45][46][47][48], such as multiphoton Rabi oscillations [49] and a single photon exciting multiple atoms [50,51].…”

Section: Introductionmentioning

confidence: 99%

Regimes of Cavity-QED under Incoherent Excitation: From Weak to Deep Strong Coupling

Mercurio¹,

Macrì²,

Gustin³

et al. 2021

Preprint

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The prototypical system constituted by a two-level atom interacting with a quantized single-mode electromagnetic field is described by the quantum Rabi model (QRM). The QRM is potentially valid at any light-matter interaction regime, ranging from the weak (where the decay rates exceeds the coupling rate) to the deep strong coupling (where the interaction rate exceeds the bare transition frequencies of the subsystems). However, when reaching the ultrastrong coupling regime, several theoretical issues may prevent the correct description of the observable dynamics of such a system: (i) the standard quantum optics master equation fails to correctly describe the interaction of this system with the reservoirs; (ii) the correct output photon rate is no longer proportional to the intracavity photon number; and (iii) the appears to violate gauge invariance. Here, we study the photon flux emission rate of this system under the incoherent excitation of the two-level atom for any light-matter interaction strength, and consider different effective temperatures. The dependence of the emission spectra on the coupling strength is the result of the interplay between energy levels, matrix elements of the observables, and the density of states of the reservoirs. Within this approach, we also study the occurence of light-matter decoupling in the deep strong coupling regime, and show how all of the obtained results are gauge invariant.

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Spin squeezing by one-photon–two-atom excitation processes in atomic ensembles

Cited by 31 publications

References 73 publications

Strong spin squeezing induced by weak squeezing of light inside a cavity

Strong spin squeezing induced by weak squeezing of light inside a cavity

Atoms in separated resonators can jointly absorb a single photon

Regimes of Cavity-QED under Incoherent Excitation: From Weak to Deep Strong Coupling

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