Quantum dimension witness with a single repeated operation
Tomasz Białecki, Tomasz Rybotycki, Josep Batle, and Adam Bednorz
Phys. Rev. A 109, L020201 (2024) - Published 13 February, 2024
The authors propose a null-hypothesis test if a quantum operation acts in the Hilbert space of limited dimension, requiring statistices of measurements following finite sequences of repeated identical operations. Applied to several IBM Quantum qubits, most of them passed the test but a significant disagreement with two-level space has been observed in one case.
Interaction-induced transition in quantum many-body detection probability
Archak Purkayastha and Alberto Imparato
Phys. Rev. A 109, L020202 (2024) - Published 23 February, 2024
The authors introduce the concept of quantum many-body detection probability. They use this to demonstrate the possibility of observing a non-equilibrium transition in a quantum many-body system using single-shot stroboscopic measurements, bypassing the need to repeat the experiment several times to obtain expectation values.

















