Spontaneous emission of matter waves from a tunable open quantum system

Krinner, Ludwig; Stewart, Michael H.; Pazmino, Arturo; Kwon, Jeong Hyun; Schneble, Dominik

doi:10.1038/s41586-018-0348-z

Cited by 128 publications

(120 citation statements)

References 45 publications

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“…The Ohmic spectral density is possible to be controlled in trapped ion system [76]. The bound state has been observed in circuit QED [77] and ultracold atom [78] systems. All these progresses show a crucial support to our argument and indicate that our finding is realizable in the state-of-art technique of quantum-optics experiments.…”

Section: Inputmentioning

confidence: 99%

Retrieving Ideal Precision in Noisy Quantum Optical Metrology

et al. 2019

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Quantum metrology employs quantum effects to attain a measurement precision surpassing the limit achievable in classical physics. However, it was previously found that the precision returns the shot-noise limit (SNL) from the ideal Zeno limit (ZL) due to the photon loss in quantum metrology based on Mech-Zehnder interferometer. Here, we find that not only the SNL can be beaten, but also the ZL can be asymptotically recovered in long-encoding-time condition when the photon dissipation is exactly studied in its inherent non-Markovian manner. Our analysis reveals that it is due to the formation of a bound state of the photonic system and its dissipative noise. Highlighting the microscopic mechanism of the dissipative noise on the quantum optical metrology, our result supplies a guideline to realize the ultrasensitive measurement in practice by forming the bound state in the setting of reservoir engineering.Introduction.-Pursuing high-precision measurement to physical quantities, metrology plays a significant role in advancing the innovation of science and technology. Restricted by the unavoidable errors, the metrology precision realized in classical physics is strongly bounded by the shot-noise limit (SNL) N −1/2 with N being the number of resource employed in the measurements. It was found that the SNL can be beaten by taking advantage of the quantum effects such as squeezing [1-3] and entanglement [4][5][6]. This inspires the birth of a newly emerged field, quantum metrology [7][8][9]. Many fascinating applications of quantum metrology have been proposed. The quantum effects of light can offer enhanced imaging resolution [10][11][12] in biological monitoring [13][14][15] and in optical lithography [16], and improved sensitivity in gravitational wave detection [17] and in radar [18]. The quantum characters of atoms or spins can provide an enhanced precision in sensing weak magnetic field [19][20][21][22][23][24] and ultimate accuracy for clocks [25][26][27].

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Section: Inputmentioning

confidence: 99%

Retrieving Ideal Precision in Noisy Quantum Optical Metrology

et al. 2019

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“…Experiments with atoms, quantum dots, or superconductors interacting with structured bath has renewed the interest in investigating these phenomena [9][10][11][12][13][14][15]. Other experimental scenarios involving cold atoms in optical lattices with state-dependent potentials are amenable to the same description, and thus the appearance of analogous phenomena have been predicted [16,17] and have recently been observed [18].…”

Section: Introductionmentioning

confidence: 90%

Effective many-body Hamiltonians of qubit-photon bound states

Shi

González-Tudela

et al. 2018

New J. Phys.

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Quantum emitters (QEs) coupled to structured baths can localize multiple photons around them and form qubit-photon bound states. In the Markovian or weak coupling regime, the interaction of QEs through these single-photon bound states is known to lead to effective many-body QE Hamiltonians with tuneable but yet perturbative interactions. In this work we study the emergence of such models in the non-Markovian or strong coupling regime in different excitation subspaces. The effective models for the non-Markovian regime with up to three excitations are characterized using analytical methods, uncovering the existence of doublons or triplon states. Furthermore, we provide numerical results for systems with multiple excitations and demonstrate the emergence of polariton models with optically tuneable interactions, whose many-body ground state exhibits a superfluid-Mott insulator transition.intuitive picture [21] is that the single-photon bound state acts as an off-resonant cavity mode that mediates interaction between the QEs. The strength and functional form of these interactions depend on the QE-bath coupling strength, detuning as well as the band-dispersion relation. Although, these interactions can be made relatively strong to overcome other dissipative mechanism, their predicted strength is ultimately limited by the Markovian conditions under which these effective description has been derived.In this work, we study the effective many-body Hamiltonians emerging when QEs couple to structured baths beyond the Markovian limit, and investigate to which point the dipole-dipole description survives in this regime. Furthermore, we study the consequences on the effective QE interactions of the emergence of multiphoton bound states, which were recently predicted in the single QE regime [15, 23-26], but whose impact in the multi QE situation has not yet been fully considered. Our analysis allows us to uncover qualitatively different interaction Hamiltonians, in which multi-photon bound states (doublons/triplons) hop from QE to the other, and analytically characterize them up to three excitations. With more excitations, we numerically characterize the emergent polariton models using density matrix renormalization group (DMRG), and show that their interactions can be controlled optically through the QE-bath interactions, allowing us to probe the quantum phase transition between superfluid and Mott insulator.This manuscript is organized as follows. In section 2, we explain the model that will be used throughout the paper and review the results in the Markovian limit to have them as reference for the next section. In section 3, we study the single excitation subspace, deriving an effective Hamiltonian to describe the dipole-dipole interaction for two and many QEs. In sections 4-6, we study the two-excitation subspace for both the two and many QE regimes. Since the phenomenology in this regime differs significantly from what is expected in a Markovian description, we use section 4 to explain the analytical tools we use to charact...

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“…Finally, to illustrate the potential of the proposed setup to explore physics beyond the one observed in solid state plat-forms, we place it in the context of the recent experiments simulating quantum optical phenomena with matter-waves [73]. There, one studies the physics of one or several (simulated) emitters interacting with the matter-waves propagating in an structured optical potential.…”

Section: Probing Twisted Bilayer Systems By Spontaneous Emissionmentioning

confidence: 99%

Cold atoms in twisted-bilayer optical potentials

González-Tudela

Cirac

2019

Phys. Rev. A

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The possibility of creating crystal bilayers twisted with respect to each other has led to the discovery of a wide range of novel electron correlated phenomena whose full understanding is still under debate. Here we propose and analyze a method to simulate twisted bilayers using cold atoms in state-dependent optical lattices. Our proposed setup can be used as an alternative platform to explore twisted bilayers which allows one to control the inter/intra-layer coupling in a more flexible way than in the solid-state realizations. We focus on square geometries but also point how it can be extended to simulate other lattices which show Dirac-like physics. This setup opens a path to observe similar physics, e.g., band narrowing, with larger twist angles, to rule out some of the mechanisms to explain the observed strongly correlated effects, as well as to study other phenomena difficult to realize with crystals. As an example of the latter we explore the quantum optical consequences of letting emitters interact with twisted bilayer reservoirs, and predict the appearance of unconventional radiation patterns and emitter interactions following the emergent Moiré geometry. arXiv:1907.06126v1 [quant-ph]

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Spontaneous emission of matter waves from a tunable open quantum system

Cited by 128 publications

References 45 publications

Retrieving Ideal Precision in Noisy Quantum Optical Metrology

Retrieving Ideal Precision in Noisy Quantum Optical Metrology

Effective many-body Hamiltonians of qubit-photon bound states

Cold atoms in twisted-bilayer optical potentials

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