<i>Colloquium</i>
: Quantum matter built from nanoscopic lattices of atoms and photons

Chang, Darrick E.; Douglas, James S.; González-Tudela, Alejandro; Hung, Chen-Lung; Kimble, H. J.

doi:10.1103/revmodphys.90.031002

Cited by 403 publications

(349 citation statements)

References 252 publications

(298 reference statements)

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“…Collective dissipation can be conveniently engineered in the laboratory or naturally arise in the presence of isotropic environments if the systems are sufficiently close to each others [47,48,57]. Furthermore, in structured environments collective dissipation can arise even between distant bodies [60,61].…”

Section: Introductionmentioning

confidence: 99%

Boosting the performance of small autonomous refrigerators via common environmental effects

et al. 2019

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We explore the possibility of enhancing the performance of small thermal machines by the presence of common noise sources. In particular, we study a prototypical model for an autonomous quantum refrigerator comprised by three qubits coupled to thermal reservoirs at different temperatures. Our results show that engineering the coupling to the reservoirs to act as common environments lead to relevant improvements in the performance. The enhancements arrive to almost double the cooling power of the original fridge without compromising its efficiency. The greater enhancements are obtained when the refrigerator may benefit from the presence of a decoherence-free subspace. The influence of coherent effects in the dissipation due to one-and two-spin correlated processes is also examined by comparison with an equivalent incoherent yet correlated model of dissipation.

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Section: Introductionmentioning

confidence: 99%

Boosting the performance of small autonomous refrigerators via common environmental effects

et al. 2019

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“…Many-body quantum optical systems have received intense interest in the recent years due to ground-breaking experiments with superconducting qubits [1][2][3] and cold atoms coupled to waveguides [4]. A paradigmatic system in quantum optics is an array of atoms coupled to freely propagating photons [5][6][7]. Waveguide quantum electrodynamics, where photons propagate in one dimension, is promising for quantum networks [8] and quantum computation [9].…”

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confidence: 99%

“…Importantly, in Eq. (7) we have neglected the radiative decay of the eigenstates, Im ε ≡ 0, which is a reasonable approximation in the considered strongly subwavelength regime with ϕ 1. If the interaction term ∝ δ x,y is omitted, the eigenstates of Eq.…”

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confidence: 99%

Photon-Mediated Localization in Two-Level Qubit Arrays

Zhong

Olekhno

et al. 2020

Phys. Rev. Lett.

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We predict the existence of a novel interaction-induced spatial localization in a periodic array of qubits coupled to a waveguide. This localization can be described as a quantum analogue of a self-induced optical lattice between two indistinguishable photons, where one photon creates a standing wave that traps the other photon. The localization is caused by the interplay between onsite repulsion due to the photon blockade and the waveguide-mediated long-range coupling between the qubits.

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“…Charges or impurities in the materials of solid-state devices are modeled in many cases as localized double-well potentials or TLFs [28,63,87,88]. A strong resonant coupling between the qubit and an environmental TLS can lead to the observation of resonances [40,89,90], but a weak off-resonant coupling can induce fluctuating Stark shifts on the qubit and thus originate correlated dephasing as in equation (2). Although TLFs naturally appear in large ensembles of them [68][69][70], the telegraph noise produced by a single TLS is an instructive and exactly solvable model capturing many features of more complex correlated non-Gaussian noises.…”

Section: A2 Telegraph Correlated Noisementioning

confidence: 99%

Correlated dephasing noise in single-photon scattering

Ramos

García-Ripoll

2018

New J. Phys.

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We develop a theoretical framework to describe the scattering of photons against a two-level quantum emitter with arbitrary correlated dephasing noise. This is particularly relevant to waveguide-QED setups with solid-state emitters, such as superconducting qubits or quantum dots, which couple to complex dephasing environments in addition to the propagating photons along the waveguide. Combining input-output theory and stochastic methods, we predict the effect of correlated dephasing in single-photon transmission experiments with weak coherent inputs. We discuss homodyne detection and photon counting of the scattered photons and show that both measurements give the modulus and phase of the single-photon transmittance despite the presence of noise and dissipation. In addition, we demonstrate that these spectroscopic measurements contain the same information as standard time-resolved Ramsey interferometry, and thus they can be used to fully characterize the noise correlations without direct access to the emitter. The method is exemplified with paradigmatic correlated dephasing models such as colored Gaussian noise, white noise, telegraph noise, and 1/fnoise, as typically encountered in solid-state environments.quantum emitter in addition to the dissipative dynamics due to the coupling to photons in the waveguide. We then relate the correlations in that noise to the average scattering matrix of individual photons and coherent wavepackets, and develop strategies to extract those correlations from actual experiments, in conjunction with earlier approaches to scattering tomography [49].The paper and our main results are organized as follows. In section 2 we introduce the model for a noisy twolevel emitter in a waveguide. We describe dephasing noise as a stationary stochastic process Δ(t) and derive the stochastic input-output equations. In section 3, we review the standard procedure of Ramsey interferometry and show how to quantify the noise correlations via the Ramsey envelope C f (t). We also introduce paradigmatic correlated noise models, which will be essential to understand the scattering results in the next sections. In particular, section 4 shows that the same information provided by Ramsey spectroscopy can be obtained from single-photon scattering experiments, where we only manipulate the qubit through the scattered photons. We solve the stochastic input-output equations for a qubit that interacts with a single propagating photon, and show that the averaged single-photon scattering matrix can be related one-to-one to the Ramsey envelope. We also discuss analytical predictions for scattering under realistic dephasing models such as colored Gaussian noise and 1/f noise. We show how the noise correlations modify the spectral lineshapes on each case, recovering simple limits such as the Lorentzian profiles that are fitted in most waveguide-QED experiments. Section 5 generalizes these ideas, showing how to measure the averaged scattering matrix using weak coherent state inputs together with homodyne or photon countin...

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Colloquium : Quantum matter built from nanoscopic lattices of atoms and photons

Cited by 403 publications

References 252 publications

Boosting the performance of small autonomous refrigerators via common environmental effects

Boosting the performance of small autonomous refrigerators via common environmental effects

Photon-Mediated Localization in Two-Level Qubit Arrays

Correlated dephasing noise in single-photon scattering

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