5 papers
Heisenberg scaling under collective non-parallel directional noise via geometric state design
Francisco Riberi, Milad Marvian, Lorenza Viola
Spin-squeezed states enable entanglement-enhanced frequency estimation; however, the achievable performance is limited in practice by decoherence. We study the problem of parameter…
Randomized Quantum Optimal Control
Leeseok Kim, Francisco Riberi, Kevin Baca +1
Quantum optimal control (QOC) aims to find control functions that optimally steer a quantum system toward a target operation. We introduce a \emph{randomized} QOC framework where o…
Boundary-localized non-Hermitian modes in an absorbing quantum walk
Francisco Riberi
We introduce and solve from first principles a continuous-time quantum walk with absorption generated by a Lindblad boundary sink of arbitrary strength. Tracing out the sink maps t…
Precision bounds for frequency estimation under collective dephasing and open-loop control
Francisco Riberi, Gerardo Paz-Silva, Lorenza Viola
Dephasing noise is a ubiquitous source of decoherence in current atomic sensors. We address the problem of entanglement-assisted frequency estimation subject to classical dephasing…
Optimal asymptotic precision bounds for nonlinear quantum metrology under collective dephasing
Francisco Riberi, Lorenza Viola
Interactions among sensors can provide, in addition to entanglement, an important resource for boosting the precision in quantum estimation protocols. Dephasing noise, however, rem…