6 papers
Operator spreading and recoverability of local quantum Fisher information in a -broken spin chain
Marcin Płodzień, Jan Chwedeńczuk
While out-of-time-order correlators establish a causal light cone for operator spreading, they do not guarantee that the parameter sensitivity carried by the operator remains local…
Topological protection of local quantum Fisher information
Marcin Płodzień, Jan Chwedeńczuk
In many-body quantum systems, unitary dynamics generically delocalize locally encoded information, causing single-site metrological sensitivity to vanish. We analytically demonstra…
Scalable quantum resources with short-range interacting spin- chains
Marcin Płodzień, Jan Chwedeńczuk
The dynamical generation of quantum resources, such as many-body entanglement, Bell correlations or spin squeezing, can be achieved via one-axis twisting (OAT) dynamics, which requ…
Volume-law protection of metrological advantage
Piotr Wysocki, Jan Chwedeńczuk, Marcin Płodzień
Although entanglement can boost metrological precision beyond the standard quantum limit, the advantage often disappears with particle loss. We demonstrate that scrambling safeguar…
Generation and read-out of many-body Bell correlations with a probe qubit
Marcin Płodzień, Jan Chwedeńczuk
As demand for quantum technologies increases, so does the need to generate and classify non-classical correlations in complex many-body systems. We introduce a simple and versatile…
Metrology using atoms in an array of double-well potentials
Danish Ali Hamza, Jan Chwedeńczuk
Quantum effects, such as entanglement, Einstein-Podolsky-Rosen steering, and Bell correlations, can enhance metrological sensitivity beyond the standard quantum limit. These correl…