Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
- URL: http://arxiv.org/abs/2312.13960v3
- Date: Tue, 9 Apr 2024 21:59:15 GMT
- Title: Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry
- Authors: Théo Malas-Danzé, Alexandre Dugelay, Nir Navon, Hadrien Kurkjian,
- Abstract summary: We propose an interferometric method to probe pair correlations in a gas of spin-1/2 fermions.
The method consists of a Ramsey sequence where both spin states of the Fermi gas are set in a superposition of a state at rest and a state with a large recoil velocity.
The off-diagonal long-range order is directly reflected in the behavior of the interferometric signal for long interrogation times.
- Score: 41.94295877935867
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We propose an interferometric method to probe pair correlations in a gas of spin-1/2 fermions. The method consists of a Ramsey sequence where both spin states of the Fermi gas are set in a superposition of a state at rest and a state with a large recoil velocity. The two-body density matrix is extracted via the fluctuations of the transferred fraction to the recoiled state. In the pair-condensed phase, the off-diagonal long-range order is directly reflected in the asymptotic behavior of the interferometric signal for long interrogation times. The method also allows to probe the spatial structure of the condensed pairs: the interferometric signal is an oscillating function of the interrogation time in the Bardeen-Cooper-Schrieffer regime; it becomes an overdamped function in the molecular Bose-Einstein condensate regime.
Related papers
- Achievable Entanglement-Assisted Communication Rate using Phase-Modulated Two-Mode Squeezed Vacuum [25.769045725438005]
We derive a closed-form achievable rate for entanglement-assisted classical communication over a lossy bosonic channel, where the entanglement is in the form of a Two-Mode Squeezed Vacuum (TMSV) modulation restricted to Phase Shift Keying (PSK)
The achievable rate is non-asymptotic in terms of the mean signal photon number, mean noise photon number, and transmissivity defining the communication channel.
arXiv Detail & Related papers (2024-10-22T16:58:39Z) - Measurement-induced transitions for interacting fermions [43.04146484262759]
We develop a field-theoretical framework that provides a unified approach to observables characterizing entanglement and charge fluctuations.
Within this framework, we derive a replicated Keldysh non-linear sigma model (NLSM)
By using the renormalization-group approach for the NLSM, we determine the phase diagram and the scaling of physical observables.
arXiv Detail & Related papers (2024-10-09T18:00:08Z) - Realizing a spatially correlated lattice interferometer [8.81055904289318]
Atom interferometers provide a powerful tool for measuring physical constants and testifying fundamental physics with unprecedented precision.
Here, we report on realizing a Ramsey-Bord'e interferometer of coherent matter waves dressed by a moving optical lattice in the gravity direction.
Our findings agree well with theoretical simulations, paving the way for high-precision interferometry with ultracold atoms.
arXiv Detail & Related papers (2024-06-24T17:54:03Z) - Systematic analysis of relative phase extraction in one-dimensional Bose gases interferometry [0.0]
We show a correction to the readout of the relative phase due to longitudinal expansion and mixing with the common phase.
We numerically assess the error propagation to the estimation of the gases' physical quantities.
arXiv Detail & Related papers (2024-03-08T18:49:09Z) - Probing quantum floating phases in Rydberg atom arrays [61.242961328078245]
We experimentally observe the emergence of the quantum floating phase in 92 neutral-atom qubits.
The site-resolved measurement reveals the formation of domain walls within the commensurate ordered phase.
As the experimental system sizes increase, we show that the wave vectors approach a continuum of values incommensurate with the lattice.
arXiv Detail & Related papers (2024-01-16T03:26:36Z) - Exotic quantum liquids in Bose-Hubbard models with spatially-modulated
symmetries [0.0]
We investigate the effect that spatially modulated continuous conserved quantities can have on quantum ground states.
We show that such systems feature a non-trivial Hilbert space fragmentation for momenta incommensurate with the lattice.
We conjecture that a Berezinskii-Kosterlitz-Thouless-type transition is driven by the unbinding of vortices along the temporal direction.
arXiv Detail & Related papers (2023-07-17T18:14:54Z) - Tuning long-range fermion-mediated interactions in cold-atom quantum
simulators [68.8204255655161]
Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior.
Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
arXiv Detail & Related papers (2022-03-31T13:32:12Z) - Quantum asymmetry and noisy multi-mode interferometry [55.41644538483948]
Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator.
We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
arXiv Detail & Related papers (2021-07-23T07:30:57Z) - Measurement-induced dark state phase transitions in long-ranged fermion
systems [3.093890460224435]
We identify an unconventional scaling phase in the quantum dynamics of free fermions with long range hopping.
A perturbative renormalization group analysis suggests that the transitions to the long-range phase are also unconventional, corresponding to a modified sine-Gordon theory.
This confirms the view of a measurement-induced phase transition as a quantum phase transition in the dark state of an effective, non-Hermitian Hamiltonian.
arXiv Detail & Related papers (2021-05-17T18:00:03Z) - A study on quantum gases: bosons in optical lattices and the
one-dimensional interacting Bose gas [0.0]
Bosonic atoms confined in optical lattices are described by the Bose-Hubbard model.
In the vicinity of the phase boundary, there are degeneracies that occur between every two adjacent lobes.
Motivated by this, we develop perturbative methods to solve the degeneracy-related problems.
arXiv Detail & Related papers (2020-06-23T15:43:14Z)
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.