358 citations · 1.6k across the 35 of their papers we have counts for
35 papers
Least Variable Quantum Counting Processes
Bita Olamaei, Florian Meier, Costantino Budroni +2
Counting processes provide a fundamental description of stochastic events ranging from photon detection to clock ticks. A central question is how accurately such events can be time…
Qutrit entanglement and joint multi-parameter estimation in an optical clock platform
Ohad Lib, Shuheng Liu, Maximilian Ammenwerth +7
Quantum metrology harnesses entanglement to improve measurement precision beyond classical limits. While standard protocols rely on two-level qubits to estimate a single parameter,…
The uncertainty geometry of finite-dimensional position and momentum
Dimpi Thakuria, Shuheng Liu, Giuseppe Vitagliano +1
Uncertainty relations are usually stated as bounds on selected combinations of variances, but the full covariance matrix contains substantially richer information about the geometr…
Thermal Entanglement and Out-of-Equilibrium Thermodynamics in 1D Bose gases
Julia Mathé, Nicky Kai Hong Li, Pharnam Bakhshinezhad +1
We investigate entanglement in and out of equilibrium in a one-dimensional Bose gas in its low-energy Bogoliubov regime. In this Gaussian setting, the state is fully characterized…
Entanglement Dimensionality of Continuous Variable States From Phase-Space Quasi-Probabilities
Shuheng Liu, Jiajie Guo, Matteo Fadel +3
The dimensionality of entanglement, quantified by the Schmidt number, is a core resource for quantum information processing. While its certification is well-established in finite-d…
Estimating the best separable approximation of non-pure spin-squeezed states
Julia Mathé, Ayaka Usui, Otfried Gühne +1
We discuss the estimation of the distance of a given mixed many-body quantum state to the set of fully separable states, applied to the concrete scenario of collective spin states.…
Uncertainty relations between quantum Fisher information and entanglement monotones
Shaowei Du, Shuheng Liu, Matteo Fadel +2
Entanglement is widely regarded as an essential resource for a number of tasks and can in some cases be quantified by figures of merit related to those tasks. In quantum metrology,…
Experimental certification of high-dimensional entanglement with randomized measurements
Ohad Lib, Shuheng Liu, Ronen Shekel +4
High-dimensional entangled states offer higher information capacity and stronger resilience to noise compared with two-dimensional systems. However, the large number of modes and s…
Characterizing resources for multiparameter estimation of SU(2) and SU(1,1) unitaries
Shaowei Du, Shuheng Liu, Frank E. S. Steinhoff +1
We analyze the task of estimating a multi-parameter unitary belonging to the or groups, in a two-bosonic-mode scenario and investigate the scaling of the precisio…
-squeezing and many-body entanglement geometry in finite-dimensional systems
Giuseppe Vitagliano, Otfried Gühne, Géza Tóth
Generalizing the well-known spin-squeezing inequalities, we study the relation between squeezing of collective -particle operators and many-body entanglement geometry in…
Characterizing high-dimensional multipartite entanglement beyond Greenberger-Horne-Zeilinger fidelities
Shuheng Liu, Qiongyi He, Marcus Huber +1
Characterizing entanglement of systems composed of multiple particles is a very complex problem that is attracting increasing attention across different disciplines related to quan…
Witnessing environment dimension through temporal correlations
Lucas B. Vieira, Simon Milz, Giuseppe Vitagliano +1
We introduce a framework to compute upper bounds for temporal correlations achievable in open quantum system dynamics, obtained by repeated measurements on the system. As these cor…
Leggett-Garg Macrorealism and temporal correlations
Giuseppe Vitagliano, Costantino Budroni
Leggett and Garg formulated macrorealist models encoding our intuition on classical systems, i.e., physical quantities have a definite value that can be measured with minimal distu…
Characterizing entanglement dimensionality from randomized measurements
Shuheng Liu, Qiongyi He, Marcus Huber +2
We consider the problem of detecting the dimensionality of entanglement with the use of correlations between measurements in randomized directions. First, exploiting the recently d…
Bounding entanglement dimensionality from the covariance matrix
Shuheng Liu, Matteo Fadel, Qiongyi He +2
High-dimensional entanglement has been identified as an important resource in quantum information processing, and also as a main obstacle for simulating quantum systems. Its certif…
Landauer vs. Nernst: What is the True Cost of Cooling a Quantum System?
Philip Taranto, Faraj Bakhshinezhad, Andreas Bluhm +9
Thermodynamics connects our knowledge of the world to our capability to manipulate and thus to control it. This crucial role of control is exemplified by the third law of thermodyn…
Number-phase uncertainty relations and bipartite entanglement detection in spin ensembles
Giuseppe Vitagliano, Matteo Fadel, Iagoba Apellaniz +4
We present a method to detect bipartite entanglement based on number-phase-like uncertainty relations in split spin ensembles. First, we derive an uncertainty relation that plays t…
Entanglement quantification in atomic ensembles
Matteo Fadel, Ayaka Usui, Marcus Huber +2
Entanglement measures quantify nonclassical correlations present in a quantum system, but can be extremely difficult to calculate, even more so, when information on its state is li…
Finite-Function-Encoding Quantum States
Paul Appel, Alexander J. Heilman, Ezekiel W. Wertz +4
We introduce finite-function-encoding (FFE) states which encode arbitrary -valued logic functions, i.e., multivariate functions over the ring of integers modulo , and investi…
Quantum field thermal machines
M. Gluza, J. Sabino, N. H. Y. Ng +7
Recent years have enjoyed an overwhelming interest in quantum thermodynamics, a field of research aimed at understanding thermodynamic tasks performed in the quantum regime. Furthe…
Ticking-clock performance enhanced by nonclassical temporal correlations
Costantino Budroni, Giuseppe Vitagliano, Mischa P. Woods
We investigate the role of nonclassical temporal correlations in enhancing the performance of ticking clocks in a discrete-time scenario. We show that the problem of optimal models…
Entanglement Certification From Theory to Experiment
Nicolai Friis, Giuseppe Vitagliano, Mehul Malik +1
Entanglement is an important resource that allows quantum technologies to go beyond the classically possible. There are many ways quantum systems can be entangled, ranging from the…
Thermodynamically optimal creation of correlations
Faraj Bakhshinezhad, Fabien Clivaz, Giuseppe Vitagliano +4
Correlations lie at the heart of almost all scientific predictions. It is therefore of interest to ask whether there exist general limitations to the amount of correlations that ca…
Leggett-Garg macrorealism and the quantum nondisturbance conditions
Roope Uola, Giuseppe Vitagliano, Costantino Budroni
We investigate the relation between a refined version of Leggett and Garg conditions for macrorealism, namely the no-signaling-in-time (NSIT) conditions, and the quantum mechanical…