Nonequilibrium phase transition of dissipative fermionic superfluids: Case study of multi-terminal Josephson junctions

• URL: http://arxiv.org/abs/2604.00574v1
• Date: Wed, 01 Apr 2026 07:29:41 GMT
• Title: Nonequilibrium phase transition of dissipative fermionic superfluids: Case study of multi-terminal Josephson junctions
• Abstract summary: We investigate nonequilibrium dynamics of a triad of fermionic superfluids connected via Josephson junctions.<n>By formulating the dissipative BCS theory for the Lindblad equation, we find that the superfluid order parameter exhibits a phase rotation.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate nonequilibrium dynamics of a triad of fermionic superfluids connected via Josephson junctions, following sudden switch-on of two-body loss in one of the three superfluids. By formulating the dissipative BCS theory for the Lindblad equation, we find that the superfluid order parameter exhibits a phase rotation, thereby giving rise to three types of dc Josephson currents corresponding to different junctions. We demonstrate that, when the tunneling amplitude $V_{31}$ between superfluids without two-body loss is weak, two-step nonequilibrium dynamical phase transition (NDPT) characterized by the vanishing dc Josephson currents occurs: dissipation first induces the NDPT by making one dc Josephson current finite, while further increasing dissipation makes this remaining dc Josephson current vanish. By contrast, when $V_{31}$ is strong, dissipation induces the NDPT in which all dc Josephson currents simultaneously vanish. An analytical study based on a simplified model further supports this observation.

Related papers

• Conditional non-Hermitian acceleration of multiphoton atomic transitions [42.138439537056954]
  Continuous monitoring can convert a dissipative channel into a resource for accelerating otherwise slow multiphoton transitions.<n>We derive effective two-state descriptions of odd-multiphoton resonances in the semiclassical and quantum Rabi models.
  arXiv  Detail & Related papers  (2026-08-10T12:59:20Z)
• Coherent spectroscopy of collective excitations in superfluid helium far from equilibrium [41.99844472131922]
  We employ ultrafast coherent control with sequences of femtosecond pulses to perform spectroscopy of excitations in superfluid helium far from equilibrium.<n>By measuring the time-resolved optical birefringence, we track the nonequilibrium dynamics of maxon pairs and Pitaevskii plateau excitations.<n>Results demonstrate the ability to extract previously inaccessible information about collective excitations in a strongly interacting quantum fluid.
  arXiv  Detail & Related papers  (2026-05-18T04:17:55Z)
• Absence of Charge Offset Drift in a Transmon Qubit [29.76636447555192]
  We report a tantalum-based transmon qubit in which the charge offset remains pinned at zero over nearly three months of measurements.<n>This exceptional stability disappears in laters, indicating a fragile mechanism at play.<n>We attribute it to the inductance of a thin superconducting layer inadvertently formed in parallel with the Josephson junction during fabrication.
  arXiv  Detail & Related papers  (2026-03-12T18:36:53Z)
• A Clue on Small-Capacitance Josephson Junction: What to Expect from Cooper Pair Ideal Conductor and Ohmic Resistor in Parallel? [0.0]
  We investigate the effects induced by quantum phase fluctuations combined with quasiparticle subgap and resistance shunts on a small-capacitance Josephson junction.<n>We find that the phase particle motion, in a quantum Josephson junction, does not change from diffusive to localized, resulting in an insulator-superconductor transition.
  arXiv  Detail & Related papers  (2025-03-31T22:08:39Z)
• Superradiant phase transitions in the quantum Rabi model: Overcoming the no-go theorem through anisotropy [30.342686040430962]
  Superradiant phase transition (SRPT) is prohibited in the paradigmatic quantum Rabi model.<n>We show two distinct types of SRPTs emerging from the normal phase in the anisotropic quantum Rabi model.
  arXiv  Detail & Related papers  (2024-12-11T11:33:29Z)
• Unifying Floquet theory of longitudinal and dispersive readout [33.7054351451505]
  We devise a Floquet theory of longitudinal and dispersive readout in circuit QED.<n>We apply them to superconducting and spin-hybrid cQED systems.
  arXiv  Detail & Related papers  (2024-07-03T18:00:47Z)
• Resilience of the quantum critical line in the Schmid transition [0.35342120781147623]
  Schmid predicted that a single Josephson junction coupled to a resistive environment undergoes a quantum phase transition to an insulating phase when the shunt resistance exceeds the resistance quantum $h/(4 e 2)$.<n>Recent measurements and theoretical studies have sparked a debate on whether the location of this transition depends on the ratio between the Josephson and the charging energies.<n>We demonstrate that the transition line between superconducting and insulating behavior is indeed independent of this energy ratio.
  arXiv  Detail & Related papers  (2024-07-01T18:12:51Z)
• Absence of a dissipative quantum phase transition in Josephson junctions: Theory [0.0]
  We investigate the superconducting - insulating quantum phase transition long believed to occur in the RSJ.<n>For all parameters, we find that shunting a junction makes it more superconducting.<n>Our results fully support and confirm the experimental invalidation of this quantum phase transition by Murani et al. in 2020.
  arXiv  Detail & Related papers  (2023-12-22T15:13:18Z)
• Shapiro steps in driven atomic Josephson junctions [0.0]
  We study driven atomic Josephson junctions realized by coupling two two-dimensional atomic clouds with a tunneling barrier. By moving the barrier at a constant velocity, dc and ac Josephson regimes are characterized by a zero and nonzero atomic density difference across the junction.
  arXiv  Detail & Related papers  (2023-07-17T18:00:02Z)
• Emergent quantum phase transition of a Josephson junction coupled to a high-impedance multimode resonator [0.0]
  We investigate the emergent criticality of a junction coupled to a multimode resonator when the number of modes is increased.<n>We find that the transition surprisingly stems from a level anticrossing involving not the ground state, but the first excited state.
  arXiv  Detail & Related papers  (2023-07-12T18:13:15Z)
• Qubit dephasing by spectrally diffusing quantum two-level systems [44.99833362998488]
  We investigate the pure dephasing of a Josephson qubit due to the spectral diffusion of two-level systems that are close to resonance with the qubit. We show that this pure dephasing mechanism can be mitigated, allowing enhancement of superconducting qubits coherence time.
  arXiv  Detail & Related papers  (2023-06-27T07:48:42Z)
• Emergence of non-Abelian SU(2) invariance in Abelian frustrated fermionic ladders [37.69303106863453]
  We consider a system of interacting spinless fermions on a two-leg triangular ladder with $pi/2$ magnetic flux per triangular plaquette. Microscopically, the system exhibits a U(1) symmetry corresponding to the conservation of total fermionic charge, and a discrete $mathbbZ$ symmetry. At the intersection of the three phases, the system features a critical point with an emergent SU(2) symmetry.
  arXiv  Detail & Related papers  (2023-05-11T15:57:27Z)
• Control of $^{164}$Dy Bose-Einstein condensate phases and dynamics with dipolar anisotropy [0.0]
  We investigate the quench dynamics of quasi-one and two dimensional dipolar Bose-Einstein condensates (dBEC) of $164$Dy atoms under the influence of a fast rotating magnetic field. We account for quantum fluctuations, critical to formation of exotic quantum droplet and supersolid phases in the extended Gross-Pitaevskii formalism.
  arXiv  Detail & Related papers  (2022-05-10T22:22:36Z)
• Peratic Phase Transition by Bulk-to-Surface Response [26.49714398456829]
  We show a duality between many-body dynamics and static Hamiltonian ground states for both classical and quantum systems. Our prediction of peratic phase transition has direct consequences in quantum simulation platforms such as Rydberg atoms and superconducting qubits.
  arXiv  Detail & Related papers  (2021-09-27T18:00:01Z)
• Collective Excitations and Nonequilibrium Phase Transition in Dissipative Fermionic Superfluids [3.6748639131154315]
  We predict a new mechanism to induce collective excitations and a nonequilibrium phase transition of fermionic superfluids via a sudden switch-on of two-body loss. We extend the BCS theory to fully incorporate a change in particle number.
  arXiv  Detail & Related papers  (2020-06-11T03:29:45Z)

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.