Dynamics of many-body localization in the presence of particle loss

Nieuwenburg, Evert P. L. van; Malo, Jorge Yago; Daley, Andrew J.; Fischer, Mark H.

doi:10.1088/2058-9565/aa9a02

Cited by 29 publications

(25 citation statements)

References 33 publications

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“…Researchers have sought to generalize powerful techniques such as optical pumping and dark-state cooling to a many-body context [1][2][3]. Additionally, there has been interest in how processes like loss and gain can influence and enrich the topological properties of lattice systems [4][5][6][7][8][9][10][11][12][13] and various types of single-particle and many-body localization phenomena in disordered systems [14][15][16][17][18]. The ability to engineer dissipation and artificial environments in cold atom systems has offered a new window into hallmark phenomena associated with quantum electrodynamics [19,20].…”

Section: Introductionmentioning

confidence: 99%

Engineering tunable local loss in a synthetic lattice of momentum states

Lapp

Ang’ong’a

et al. 2019

New J. Phys.

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Dissipation can serve as a powerful resource for controlling the behavior of open quantum systems.Recently there has been a surge of interest in the influence of dissipative coupling on large quantum systems and, more specifically, how these processes can influence band topology and phenomena like many-body localization. Here, we explore the engineering of local, tunable dissipation in so-called synthetic lattices, arrays of quantum states that are parametrically coupled in a fashion analogous to quantum tunneling. Considering the specific case of momentum-state lattices, we investigate two distinct mechanisms for engineering controlled loss: one relying on an explicit form of dissipation by spontaneous emission, and another relying on reversible coupling to a large reservoir of unoccupied states. We experimentally implement the latter and demonstrate the ability to tune the local loss coefficient over a large range. The introduction of controlled loss to the synthetic lattice toolbox promises to pave the way for studying the interplay of dissipation with topology, disorder, and interactions.

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Section: Introductionmentioning

confidence: 99%

Engineering tunable local loss in a synthetic lattice of momentum states

Lapp

Ang’ong’a

et al. 2019

New J. Phys.

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“…However, as shown recently [13], this operator can be efficiently applied if we split our state representation into parity-conserving sectors. In a similar manner, we will benefit from making use of number-conserving sectors [40,41], which optimize time evolution calculations for pure states implementing quantum-trajectories techniques for the master equation [28].…”

Section: Numerical Methods and The Relevance Of System Symmetriesmentioning

confidence: 99%

“…This applies, in particular, to our understanding of incoherent light scattering and the resulting dephasing of the many-body state [3,4] and to our treatment of atom loss [5]. Studying these sources of dissipation is of importance well beyond gaining a better understanding of experimental imperfections: it allows for the use of dissipation (1) in probing many-body states and their dynamics [6,7], (2) in the controlled preparation of interesting many-body states [6,8], and (3) in understanding how signatures of fundamental effects from closed systems (e.g., many-body localization) survive in the presence of coupling to an environment [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Particle statistics and lossy dynamics of ultracold atoms in optical lattices

et al. 2018

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Experimental control over ultracold quantum gases has made it possible to investigate low-dimensional systems of both bosonic and fermionic atoms. In closed one-dimensional systems there are many similarities in the dynamics of local quantities for spinless fermions and strongly interacting "hard-core" bosons, which on a lattice can be formalized via a Jordan-Wigner transformation. In this study, we analyze the similarities and differences for spinless fermions and hard-core bosons on a lattice in the presence of particle loss. The removal of a single fermion causes differences in local quantities compared with the bosonic case because of the different particle exchange symmetry in the two cases. We identify deterministic and probabilistic signatures of these dynamics in terms of local particle density, which could be measured in ongoing experiments with quantum gas microscopes.

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“…We then consider the effects of dephasing (i.e., γ I ≡ γ deph , L = c † s c s ) acting on the QD, which occurs naturally through coupling to additional degrees of freedom in the solid state, and can be engineered in cold atoms through light scattering or noise [2,[48][49][50][51]. We show that dephasing acting on the QD affects identically the source and drain Cooper-pair currents, whereas leaves unchanged the electron currents.…”

Section: (Panels A-d) We Show Thementioning

confidence: 99%

Controlling Quantum Transport via Dissipation Engineering

et al. 2019

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Inspired by the microscopic control over dissipative processes in quantum optics and cold atoms, we develop an open-system framework to study dissipative control of transport in strongly interacting fermionic systems, relevant for both solid state and cold atom experiments. We show how subgap currents exhibiting Multiple Andreev Reflections -the stimulated transport of electrons in the presence of Cooper-pairs -can be controlled via engineering of superconducting leads or superfluid atomic gases. Our approach incorporates dissipation within the channel, which is naturally occurring and can be engineered in cold gas experiments. This opens opportunities for engineering many phenomena with transport in strongly interacting systems. As examples, we consider particle loss and dephasing, and note different behaviour for currents with different microscopic origin. We also show how to induce nonreciprocal electron and Cooper-pair currents.Introduction. Understanding and controlling the outof-equilibrium dynamics of strongly interacting manybody systems constitutes one of the key forefronts in quantum physics across a variety of subfields in experiment and theory. In this context, opportunities to achieve their control via dissipation mechanisms have arisen [1,2], as is applied for few-body systems in quantum optics [3,4]. This is especially true in cold-atom platforms, where large separations between frequency scales allows well-controlled theoretical models and implementations of dissipative processes, as realized for laser cooling and trapping [5]. The longer timescales of cold atom experiments also allow dynamics to be tracked and potentially controlled time-dependently [6,7]. Outof-equilibrium transport dynamics remain a ubiquitous paradigm in the solid state [8], and recent developments in cold atom systems have also made it possible to engineer quantised transport of atoms between reservoirs, as well as quantum point contacts and waveguides [9][10][11][12]. Here we explore the emerging new opportunity of using dissipation engineering to achieve control of quantum transport properties, that are relevant for both coldatom and solid-state platforms.

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Dynamics of many-body localization in the presence of particle loss

Cited by 29 publications

References 33 publications

Engineering tunable local loss in a synthetic lattice of momentum states

Engineering tunable local loss in a synthetic lattice of momentum states

Particle statistics and lossy dynamics of ultracold atoms in optical lattices

Controlling Quantum Transport via Dissipation Engineering

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