Detecting quantum backflow by the density of a Bose-Einstein Condensate
arXiv:1302.3373 · doi:10.1103/PhysRevA.87.053618
Abstract
Quantum backflow is a classically forbidden effect consisting in a negative flux for states with negligible negative momentum components. It has never been observed experimentally so far. We derive a general relation that connects backflow with a critical value of the particle density, paving the way for the detection of backflow by a density measurement. To this end, we propose an explicit scheme with Bose-Einstein condensates, at reach with current experimental technologies. Remarkably, the application of a positive momentum kick, via a Bragg pulse, to a condensate with a positive velocity may cause a current flow in the negative direction.
5 pages, 4 figures
References in corpus (1)
Cited by in corpus (30)
- What does one measure, when one measures the arrival times of a quantum particle?
- Demonstrating backflow in classical two beams' interference
- Quantum Backflow States from Eigenstates of the Regularized Current Operator
- Quantum backflow in a ring
- Quantum backflow and scattering
- Equivalence between quantum backflow and classically forbidden probability flow in a diffraction-in-time problem
- Times of Arrival and Gauge Invariance
- Time delays and advances in classical and quantum systems
- A quasi-probability for the arrival time problem with links to backflow and the Leggett-Garg inequalities
- Scheme for accelerating quantum tunneling dynamics
- Interference of spin-orbit coupled Bose-Einstein condensates
- Probability backflow for correlated quantum states
- Quantum backflow effect and nonclassicality
- Angular momentum quantum backflow in the noncommutative plane
- Experiment-friendly formulation of quantum backflow
- Leggett-Garg Correlation Functions from Non-Invasive Velocity Measurement Continuous in Time
- On the experiment-friendly formulation of quantum backflow
- Quantum backflow for many-particle systems
- Unbounded quantum backflow in two dimensions
- Time-of-arrival distributions for continuous quantum systems and application to quantum backflow
- Observation of single-photon azimuthal backflow with weak measurement
- Quantum Back Flow Across a Black Hole Horizon in a Toy Model Approach
- Quantum backflow for dissipative two-identical-particle systems
- Quantum backflow current in a ring: Optimal bounds and fractality
- Quantum backflow for two identical particles
- Searching for Bloch wave packets with almost definite momentum direction
- Simulating quantum backflow on a quantum computer
- Quantum control of exciton motion in electric field
- Preparing Quantum Backflow States by Large Momentum Transfer
- Quantum Shape Effects