Cavity QED with quantum gases: new paradigms in many-body physics

Mivehvar, Farokh; Piazza, Francesco; Donner, Tobias; Ritsch, Helmut

doi:10.1080/00018732.2021.1969727

Cited by 160 publications

(70 citation statements)

References 361 publications

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“…In recent years, interest has shifted from few particle systems to the control of many-body quantum systems. For example, there are opportunities to explore particularly interesting many-body physics [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] with many atoms in optical cavities in regimes where the atoms interact strongly amongst themselves and also with the cavity mode(s), as depicted in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement

Link¹,

Müller²,

Lena³

et al. 2021

Preprint

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Atoms in multimode cavity QED systems provide an exciting platform to study many-body phenomena in regimes where the atoms are strongly coupled amongst themselves and with the cavity. An important challenge in this, and other related non-Markovian open quantum systems is to understand what information we gain about the atoms from continuous measurement of the output light. In this work, we address this problem, describing the reduced atomic state via a conditioned hierarchy of equations of motion, which provides an exact conditioned reduced description under monitoring (and continuous feedback). We utilise this formalism to study how different monitoring for modes of a multimode cavity affects our information gain for an atomic state, and to improve spin squeezing via measurement and feedback in a strong coupling regime. This work opens opportunities to understand continuous monitoring of non-Markovian open quantum systems, both on a practical and fundamental level.

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Section: Introductionmentioning

confidence: 99%

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement

Link¹,

Müller²,

Lena³

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…The optical lattice is sufficiently deep to facilitate a tight binding description of the system limited to its lowest band. In the limit when cavity field may be adiabatically eliminated from the problem, as studied often both experimentally and theoretically [43,46,[59][60][61][62][63][64] (for a broad reviews see [65,66]), the Hamiltonian of the problem reads (see [41] for a recent derivation):…”

Section: Model and Methodsmentioning

confidence: 99%

Many-body localization regime for cavity induced long-range interacting models

Chanda,

Zakrzewski

2021

Preprint

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Many-body localization (MBL) features are studied here for a large spin chain model with long range interactions. The model corresponds to cold atoms placed inside a cavity and driven by an external laser field with long range interactions coming from rescattering of cavity photons. Earlier studies were limited to small sizes amenable to exact diagonalization. It is shown that nonergodic features and MBL may exist in this model for random disorder as well as in the presence of tilted potential on experimental time scales also for experimentally relevant system sizes using tensor networks algorithms.

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“…since the term proportional to |A| 2 dominates the dynamics both in the short and long time limits [25]. Combining equations (10), (11), and (12) yields…”

mentioning

confidence: 95%

“…In order to achieve such goals, it is often necessary to realise large-scale tuneable systems, whose parameters can be modified by suitable manipulation of the external environment and which retain quantum coherence also at the many-body level. Therefore, the number of experimental applications in the field of driven-dissipative many-body systems is steadily increasing [5][6][7][8][9][10][11][12].…”

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confidence: 99%

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Universal scaling at a pre-thermal dark state

Syed,

Enss,

Defenu

2021

Preprint

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Recent experimental and theoretical progress, as well as the prospect of commercially viable quantum technologies have inspired great interest in the study of open quantum systems and their dynamics. Many open quantum systems are well described by an effective non-hermitian Hamiltonian generating a time-evolution that allows eigenstates to decay and dissipate to the environment. In this framework, quantum coherent scaling is traditionally tied to the appearance of dark states, where the effect of dissipation becomes negligible. Here, we discuss the universal dynamical scaling after a sudden quench of the non-hermitian O(N ) model Hamiltonian. While universality is generally spoiled by non-hermiticity, we find that for a given set of internal parameters short-time scaling behaviour is restored with an initial slip exponent profoundly different from that of closed quantum systems. This result is tied to the compensation of dissipation by interaction effects at short times leading to a pre-thermal dark state, where coherent many-body dynamics can be still observed.

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Cavity QED with quantum gases: new paradigms in many-body physics

Cited by 160 publications

References 361 publications

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement

Many-body localization regime for cavity induced long-range interacting models

Universal scaling at a pre-thermal dark state

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