Suppression of Bogoliubov momentum pairing and emergence of non-Gaussian correlations in ultracold interacting Bose gases

• URL: http://arxiv.org/abs/2401.15340v2
• Date: Thu, 20 Jun 2024 20:06:31 GMT
• Title: Suppression of Bogoliubov momentum pairing and emergence of non-Gaussian correlations in ultracold interacting Bose gases
• Authors: Jan-Philipp Bureik, Gaétan Hercé, Maxime Allemand, Antoine Tenart, Tommaso Roscilde, David Clément,
• Abstract summary: Strongly correlated quantum matter possesses properties that cannot be understood in terms of linear fluctuations and free quasi-particles. Quantum fluctuations in these systems are indeed large and generically exhibit non-Gaussian statistics. We experimentally study interacting Bose gases from the weakly to the strongly interacting regime through single-atom-resolved correlations in momentum space.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Strongly correlated quantum matter -- such as interacting electron systems or interacting quantum fluids -- possesses properties that cannot be understood in terms of linear fluctuations and free quasi-particles. Quantum fluctuations in these systems are indeed large and generically exhibit non-Gaussian statistics -- a property captured only by inspecting high-order correlations, whose quantitative reconstruction poses a formidable challenge to both experiments and theory alike. A prime example of correlated quantum matter is the strongly interacting Bose fluid, realized by superfluid Helium and, more recently, ultra-cold atoms. Here, we experimentally study interacting Bose gases from the weakly to the strongly interacting regime through single-atom-resolved correlations in momentum space. We observe that the Bogoliubov pairing among modes of opposite momenta, emblematic of the weakly interacting regime, is suppressed as interactions become stronger. This departure from the predictions of Bogoliubov theory signals the onset of the strongly correlated regime, as confirmed by numerical simulations that highlight the role of non-linear quantum fluctuations in our system. Additionally, our measurements unveil a non-zero four-operator cumulant at even stronger interactions, which is a direct signature of non-Gaussian correlations. These results shed light on the emergence and physical origin of non-Gaussian correlations in ensembles of interacting bosons.

Related papers

• Quantized Thouless pumps protected by interactions in dimerized Rydberg tweezer arrays [44.99833362998488]
  We study Thouless pumps, i.e., adiabatic topological transport, in an interacting spin chain described by the dimerized XXZ Hamiltonian. In the noninteracting case, quantized Thouless pumps can only occur when a topological singularity is encircled adiabatically. In the presence of interactions, such topological transport can even persist for exotic paths in which the system gets arbitrarily close to the singularity.
  arXiv  Detail & Related papers  (2024-02-14T16:58:21Z)
• Persistent non-Gaussian correlations in out-of-equilibrium Rydberg atom arrays [0.0]
  We present a mechanism by which an initial state of a Rydberg atom array can retain persistent non-Gaussian correlations following a global quench. These long-lived non-Gaussian states may have practical applications as quantum memories or stable resources for quantum-information protocols.
  arXiv  Detail & Related papers  (2023-06-21T12:07:45Z)
• Dipolar quantum solids emerging in a Hubbard quantum simulator [45.82143101967126]
  Long-range and anisotropic interactions promote rich spatial structure in quantum mechanical many-body systems. We show that novel strongly correlated quantum phases can be realized using long-range dipolar interaction in optical lattices. This work opens the door to quantum simulations of a wide range of lattice models with long-range and anisotropic interactions.
  arXiv  Detail & Related papers  (2023-06-01T16:49:20Z)
• Neural-network quantum states for ultra-cold Fermi gases [49.725105678823915]
  This work introduces a novel Pfaffian-Jastrow neural-network quantum state that includes backflow transformation based on message-passing architecture. We observe the emergence of strong pairing correlations through the opposite-spin pair distribution functions. Our findings suggest that neural-network quantum states provide a promising strategy for studying ultra-cold Fermi gases.
  arXiv  Detail & Related papers  (2023-05-15T17:46:09Z)
• Trapped-Ion Quantum Simulation of Collective Neutrino Oscillations [55.41644538483948]
  We study strategies to simulate the coherent collective oscillations of a system of N neutrinos in the two-flavor approximation using quantum computation. We find that the gate complexity using second order Trotter- Suzuki formulae scales better with system size than with other decomposition methods such as Quantum Signal Processing.
  arXiv  Detail & Related papers  (2022-07-07T09:39:40Z)
• Entangled multiplets and unusual spreading of quantum correlations in a continuously monitored tight-binding chain [0.0]
  We analyze the dynamics of entanglement in a paradigmatic noninteracting system subject to continuous monitoring of the local densities. Results shed new light onto the behavior of correlations in quantum dynamics and further show that these may be enhanced by a (weak) continuous monitoring process.
  arXiv  Detail & Related papers  (2022-06-15T20:36:08Z)
• Time evolution of quantum correlations in presence of state dependent bath [0.0]
  We study the extent to which initial system-bath correlations influence the dynamics of quantum entanglement and coherence. It is shown that at low temperatures, the initial correlations have no role to play while at high temperatures, these correlations strongly influence the dynamics.
  arXiv  Detail & Related papers  (2022-04-01T14:50:16Z)
• Simulation of Collective Neutrino Oscillations on a Quantum Computer [117.44028458220427]
  We present the first simulation of a small system of interacting neutrinos using current generation quantum devices. We introduce a strategy to overcome limitations in the natural connectivity of the qubits and use it to track the evolution of entanglement in real-time.
  arXiv  Detail & Related papers  (2021-02-24T20:51:25Z)
• Probing eigenstate thermalization in quantum simulators via fluctuation-dissipation relations [77.34726150561087]
  The eigenstate thermalization hypothesis (ETH) offers a universal mechanism for the approach to equilibrium of closed quantum many-body systems. Here, we propose a theory-independent route to probe the full ETH in quantum simulators by observing the emergence of fluctuation-dissipation relations. Our work presents a theory-independent way to characterize thermalization in quantum simulators and paves the way to quantum simulate condensed matter pump-probe experiments.
  arXiv  Detail & Related papers  (2020-07-20T18:00:02Z)
• Decay and recurrence of non-Gaussian correlations in a quantum many-body system [0.45823749779393547]
  We observe a non-Gaussian initial state evolving under non-interacting dynamics in a quantum many-body system. This non-equilibrium evolution is triggered by abruptly switching off the effective interaction between the observed collective degrees of freedom. A description of this dynamics requires a novel mechanism for the emergence of Gaussian correlations.
  arXiv  Detail & Related papers  (2020-03-03T21:49:03Z)
• Spreading of correlations in Markovian open quantum systems [0.0]
  We show that the quasi-particle picture remains valid for open quantum systems. For free fermions with gain/loss dissipation we provide formulae fully describing incoherent and quasiparticle contributions.
  arXiv  Detail & Related papers  (2020-02-21T19:42:32Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.