542 citations · 3.6k across the 71 of their papers we have counts for
71 papers · 1 filter
Reaching the Limits of Ground-State Metrology with Many-Body Probes
Erik L. André, Víctor Izquierdo, Ricard Puig +2
We investigate the physical requirements to reach the ultimate limits of ground-state metrology -- i.e., the estimation of an unknown parameter of an -body Hamiltonian via m…
Dynamical, thermal, and ground-state multiparameter quantum metrology: Fundamental limits and their attainability in magnetometry
Riccardo Pedroni, Víctor Izquierdo, Advay Burte +3
We consider the simultaneous estimation of multiple parameters in Hamiltonians of the form , where encodes the unknown parameters and $H…
Quantum sequential parameter testing
Simon Morelli, Ricard Ravell Rodríguez, John Calsamiglia +3
Sequential strategies in hypothesis testing use a variable number of measurement rounds, allowing a decision to be made as soon as the observed data provide a prescribed level of e…
Quantum-Enhanced Zero-Error Communication and Storage under Positional Uncertainty
Arnau Diebra, David González-Lociga, Mark Hillery +2
Permutation channels model communication and storage scenarios in which the positional identity of the physical carriers is partially or completely lost, so that the transmitted in…
Sequential analysis in a continuous spin-noise quantum sensor
Elisabet Roda-Salichs, Giulio Gasbarri, Antoni Alou +5
Many control and detection applications require real-time analysis of signals from sensors, in order to quickly and accurately act upon events revealed by the sensors. Such signal…
Quantum Advantage in Identifying the Parity of Permutations with Certainty
Arnau Diebra, Santiago Llorens, David González-Lociga +4
We establish a sharp quantum advantage in determining the parity (even/odd) of an unknown permutation applied to any number of particles. Classically, this is impossible…
An information-theoretic proof of the Planckian bound for thermalization
Paolo Abiuso, Alberto Rolandi, John Calsamiglia +2
We demonstrate that quantum mechanics entails a fundamental lower bound on the thermalization time of any system. At finite temperature, we show that is bounded by half the…
Approach to optimal quantum transport via states over time
Matt Hoogsteder-Riera, John Calsamiglia, Andreas Winter
We approach the problem of constructing a quantum analogue of the immensely fruitful classical transport cost theory of Monge from a new angle. Going back to the original motivatio…
From dynamical to steady-state many-body metrology: Precision limits and their attainability with two-body interactions
Ricard Puig, Pavel Sekatski, Paolo Andrea Erdman +3
We consider the estimation of an unknown parameter via a many-body probe. The probe is initially prepared in a product state and many-body time-independent interactions enhance…
Fundamental limits of metrology at thermal equilibrium
Paolo Abiuso, Pavel Sekatski, John Calsamiglia +1
We consider the estimation of an unknown parameter through a quantum probe at thermal equilibrium. The probe is assumed to be in a Gibbs state according to its Hamiltonian $H_θ…
Sequential hypothesis testing for continuously-monitored quantum systems
Giulio Gasbarri, Matias Bilkis, Elisabet Roda-Salichs +1
We consider a quantum system that is being continuously monitored, giving rise to a measurement signal. From such a stream of data, information needs to be inferred about the under…
Universal algorithms for quantum data learning
Marco Fanizza, Michalis Skotiniotis, John Calsamiglia +2
Operating quantum sensors and quantum computers would make data in the form of quantum states available for purely quantum processing, opening new avenues for studying physical pro…
Ultimate limits for quickest quantum change-point detection
Marco Fanizza, Christoph Hirche, John Calsamiglia
Detecting abrupt changes in data streams is crucial because they are often triggered by events that have important consequences if left unattended. Quickest change point detection…
Phase estimation with limited coherence
D. Munoz-Lahoz, J. Calsamiglia, J. A. Bergou +1
We investigate the ultimate precision limits for quantum phase estimation in terms of the coherence, , of the probe. For pure states, we give the minimum estimation variance att…
Reinforcement-learning calibration of coherent-state receivers on variable-loss optical channels
Matias Bilkis, Matteo Rosati, John Calsamiglia
We study the problem of calibrating a quantum receiver for optical coherent states when transmitted on a quantum optical channel with variable transmissivity, a common model for lo…
Quantum Sequential Hypothesis Testing
Esteban Martínez-Vargas, Christoph Hirche, Gael Sentís +4
We introduce sequential analysis in quantum information processing, by focusing on the fundamental task of quantum hypothesis testing. In particular our goal is to discriminate bet…
Squeezing-enhanced communication without a phase reference
Marco Fanizza, Matteo Rosati, Michalis Skotiniotis +2
We study the problem of transmitting classical information using quantum Gaussian states on a family of phase-noise channels with a finite decoherence time, such that the phase-ref…
Real-time calibration of coherent-state receivers: learning by trial and error
M. Bilkis, M. Rosati, R. Morral Yepes +1
The optimal discrimination of coherent states of light with current technology is a key problem in classical and quantum communication, whose solution would enable the realization…
Accessible coherence in open quantum system dynamics
María García Díaz, Benjamin Desef, Matteo Rosati +5
Quantum coherence generated in a physical process can only be cast as a potentially useful resource if its effects can be detected at a later time. Recently, the notion of non-cohe…
All tight correlation Bell inequalities have quantum violations
Llorenç Escolà-Farràs, John Calsamiglia, Andreas Winter
It is by now well-established that there exist non-local games for which the best entanglement-assisted performance is not better than the best classical performance. Here we show…
Beyond the swap test: optimal estimation of quantum state overlap
Marco Fanizza, Matteo Rosati, Michalis Skotiniotis +2
We study the estimation of the overlap between two unknown pure quantum states of a finite dimensional system, given and copies of each type. This is a fundamental primitiv…
Unsupervised classification of quantum data
Gael Sentís, Alex Monràs, Ramon Muñoz-Tapia +2
We introduce the problem of unsupervised classification of quantum data, namely, of systems whose quantum states are unknown. We derive the optimal single-shot protocol for the bin…
Identification of malfunctioning quantum devices
M. Skotiniotis, Santiago Llorens, R. Hotz +2
We consider the problem of correctly identifying a malfunctioning quantum device that forms part of a network of such devices, which can be considered as the quantum analogue o…
Using and reusing coherence to realize quantum processes
María García Díaz, Kun Fang, Xin Wang +4
Coherent superposition is a key feature of quantum mechanics that underlies the advantage of quantum technologies over their classical counterparts. Recently, coherence has been re…