Quantum Point Contact with Local Two-body Loss
arXiv:2505.24391 · doi:10.1103/xfmf-4s1l
Abstract
Motivated by recent advances in ultracold atomic gas experiments, we investigate a two-terminal mesoscopic system in which two-body loss occurs locally at the center of a one-dimensional chain. By means of the self-consistent Born approximation in the Keldysh formalism, we uncover mesoscopic current formulas that are experimentally relevant and applicable to the weak dissipation regime. Although these formulas are analogous to those for systems with one-body loss, it turns out that the channel transmittance and loss probability depend on the nonequilibrium occupation at the lossy site. We demonstrate that this occupation dependence leads to a weaker suppression of currents in the presence of two-body loss compared to one-body loss.
References in corpus (19)
- Quantum trajectories and open many-body quantum systems
- Strong dissipation inhibits losses and induces correlations in cold molecular gases
- Quantum Zeno dynamics: mathematical and physical aspects
- Signatures of Many-Body Localization in a Controlled Open Quantum System
- Atomtronic circuits: from many-body physics to quantum technologies
- Two-terminal transport measurements with cold atoms
- Non-Gaussian correlations imprinted by local dephasing in fermionic wires
- Exact description of quantum stochastic models as quantum resistors
- Superfluid signatures in a dissipative quantum point contact
- Symmetry-protected transport through a lattice with a local particle loss
- Exact description of transport and non-reciprocity in monitored quantum devices
- Comparative study for two-terminal transport through a lossy one-dimensional quantum wire
- Engineered Open Systems and Quantum Simulations with Atoms and Ions
- Fractional Quantum Zeno Effect Emerging from Non-Hermitian Physics
- DC transport in a dissipative superconducting quantum point contact
- Dissipative realization of Kondo models
- Variational approach to the dynamics of dissipative quantum impurity models
- Semi-group influence matrices for non-equilibrium quantum impurity models
- Quantum wires with local particle loss: Transport manifestations of fluctuation-induced effects