Ultrastrong coupling between light and matter

Kockum, Anton Frisk; Miranowicz, Adam; Liberato, Simone De; Savasta, Salvatore; Nori, Franco

doi:10.1038/s42254-018-0006-2

Cited by 1,157 publications

(706 citation statements)

References 228 publications

(358 reference statements)

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“…The DSC regime has also now been demonstrated experimentally in superconducting circuits [39,40], and terahertz light-Landau polariton couplings in nanostructure metamaterials [41]. A comprehensive review of such phenomenon was recently published [42].…”

Section: Introductionmentioning

confidence: 98%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

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Several experimental implementations of cavity-magnon systems are presented. First an Yttrium Iron Garnet (YIG) block is placed inside a re-entrant cavity where the resulting hybrid mode is measured to be in the ultra strong coupling (USC) regime. When fully hybridised the ratio between the coupling rate and uncoupled mode frequencies is determined to be g/ω=0.46. Next a thin YIG cylinder is placed inside a loop gap cavity. The bright mode of this cavity couples to the YIG sample and is similarly measured to be in the USC regime with ratio of coupling rate to uncoupled mode frequencies as g/ω=0.34. A larger spin density medium such as lithium ferrite (LiFe) is expected to improve couplings by a factor of 1.46 in both systems as coupling strength is shown to be proportional to the square root of spin density and magnetic moment. Such strongly coupled systems are potentially useful for cavity QED, hybrid quantum systems and precision dark matter detection experiments. The YIG disc in the loop gap cavity, is, in particular, shown to be a strong candidate for dark matter detection. Finally, a LiFe sphere inside a two post re-entrant cavity is considered. In past work it was shown that the magnon mode in the sample has a turnover point in frequency (Goryachev et al 2018 Phys. Rev. B 97 155129). Additionally, it was predicted that if the system was engineered such that it fully hybridised at this turnover point the cavity-magnon polariton transition frequency would become insensitive to both first and second order magnetic bias field fluctuations, a result useful for precision frequency applications. This work implements such a system by engineering the cavity mode frequency to near this turnover point, with suppression in sensitivity to second order bias magnetic field fluctuations shown.

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Section: Introductionmentioning

confidence: 98%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

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“…If this is not the case, then the system is in the ultrastrong coupling or deep strong coupling regimes. [60,61] While the above discussion is framed in terms of photons in electromagnetic cavities, any other oscillating system that admits second quantization can be treated in the same way. In particular, mechanical vibrations in high Q membranes and beams can be described in terms of phonons, and excitations of magnetostatic modes as magnons.…”

Section: Weak and Strong Couplingmentioning

confidence: 99%

Coherent Conversion Between Microwave and Optical Photons—An Overview of Physical Implementations

et al. 2019

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Quantum information technology based on solid state qubits has created much interest in converting quantum states from the microwave to the optical domain. Optical photons, unlike microwave photons, can be transmitted by fiber, making them suitable for long distance quantum communication. Moreover, the optical domain offers access to a large set of very well‐developed quantum optical tools, such as highly efficient single‐photon detectors and long‐lived quantum memories. For a high fidelity microwave to optical transducer, efficient conversion at single photon level and low added noise is needed. Currently, the most promising approaches to build such systems are based on second‐order nonlinear phenomena such as optomechanical and electro‐optic interactions. Alternative approaches, although not yet as efficient, include magneto‐optical coupling and schemes based on isolated quantum systems like atoms, ions, or quantum dots. Herein, the necessary theoretical foundations for the most important microwave‐to‐optical conversion experiments are provided, their implementations are described, and the current limitations and future prospects are discussed.

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“…Among many applications of squeezing, we mention also recent proposals of an exponential enhancement of lightmatter interactions via squeezing [20][21][22][23][24][25] (for a review see Ref. [26]). Such increased interactions at the singlephoton level can fundamentally change nonlinear optical effects, including photon blockade (PB) [27,28].…”

Section: A Squeezed States Of Lightmentioning

confidence: 99%

“…These values can also be obtained from Eqs. (25) and (26) in their special cases for α = r = 0. By induction, we conclude that for any order k > 1, the correlation function g (k) (0) for the thermal state with the mean photon number n becomes…”

Section: Appendix D: Classical Simulation Of Photon-induced Tunnelingmentioning

confidence: 99%

Two-photon blockade and photon-induced tunneling generated by squeezing

et al. 2019

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Inspired by the recent experiment of Hamsen et al. [Phys. Rev. Lett. 118, 133604 (2017)], which demonstrated two-photon blockade in a driven nonlinear system (composed of a harmonic cavity with a driven atom), we show that two-photon blockade and other nonstandard types of photonblockade and photon-induced tunneling can be generated in a driven harmonic cavity without an atom or any other kind of nonlinearity, but instead coupled to a nonlinear (i.e., squeezed) reservoir. We also simulate these single-and two-photon effects with squeezed coherent states and displaced squeezed thermal states.

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Ultrastrong coupling between light and matter

Cited by 1,157 publications

References 228 publications

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

Coherent Conversion Between Microwave and Optical Photons—An Overview of Physical Implementations

Two-photon blockade and photon-induced tunneling generated by squeezing

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