78 citations · 239 across the 21 of their papers we have counts for
21 papers
Characterizing quantum channels from local-unitary invariants
Salwa Shaglel, Satoya Imai
We develop systematic frameworks for characterizing the entanglement properties of two-qubit channels beyond unitary settings. We introduce averaged local-unitary invariants, refer…
Hierarchy of saturation conditions for multiparameter quantum metrology bounds
Satoya Imai, Jing Yang, Luca Pezzè
The quantum Cramér-Rao (QCR) bound sets the ultimate local precision limit for unbiased multiparameter estimation. Unlike in the single-parameter case, however, its saturability is…
A geometric criterion for optimal measurements in multiparameter quantum metrology
Jing Yang, Satoya Imai, Luca Pezzè
Determining when the multiparameter quantum Cramér--Rao bound (QCRB) is saturable with experimentally relevant single-copy measurements is a central open problem in quantum metrolo…
Chiral Symmetries and Multiparticle Entanglement
Sophia Denker, Satoya Imai, Otfried Gühne
Bosons and fermions are defined by their exchange properties and the underlying symmetries determine the structure of the corresponding state spaces. For two particles there are tw…
Semi-classical geometric tensor in multiparameter quantum information
Satoya Imai, Jing Yang, Luca Pezzè
The discrepancy between quantum distinguishability in Hilbert space and classical distinguishability in probability space is expressed by the gap between the quantum and classical…
Entanglement in the symmetric subspace: mapping multipartite to bipartite states
Carlo Marconi, Satoya Imai
We propose a technique to investigate multipartite entanglement in the symmetric subspace. Our approach is to map an -qubit symmetric state onto a bipartite symmetric state of h…
Real randomized measurements for analyzing properties of quantum states
Jin-Min Liang, Satoya Imai, Shuheng Liu +3
Randomized measurements are useful for analyzing quantum systems especially when quantum control is not fully perfect. However, their practical realization typically requires multi…
Reference-frame-independent quantum metrology
Satoya Imai, Otfried Gühne, Géza Tóth
How can we perform a metrological task if only limited control over a quantum system is given? Here, we present systematic methods for conducting nonlinear quantum metrology in sce…
Metrological usefulness of entanglement and nonlinear Hamiltonians
Satoya Imai, Augusto Smerzi, Luca Pezzè
A central task in quantum metrology is to exploit quantum correlations to outperform classical sensitivity limits. Metrologically useful entanglement is identified when the quantum…
Error estimation of different schemes to measure spin-squeezing inequalities
Jan Lennart Bönsel, Satoya Imai, Ye-Chao Liu +1
How can we analyze quantum correlations in large and noisy systems without quantum state tomography? An established method is to measure total angular momenta and employ the so-cal…
Geometry of two-body correlations in three-qubit states
Shravan Shravan, Simon Morelli, Otfried Gühne +1
We study restrictions of two-body correlations in three-qubit states, using three local-unitarily invariant coordinates based on the Bloch vector lengths of the marginal states. Fi…
Collective randomized measurements in quantum information processing
Satoya Imai, Géza Tóth, Otfried Gühne
The concept of randomized measurements on individual particles has proven to be useful for analyzing quantum systems and is central for methods like shadow tomography of quantum st…
Experimental verification of bound and multiparticle entanglement with the randomized measurement toolbox
Chao Zhang, Yuan-Yuan Zhao, Nikolai Wyderka +10
In recent years, analysis methods for quantum states based on randomized measurements have been investigated extensively. Still, in the experimental implementations these methods w…
Quantum speed limit for states and observables of perturbed open systems
Benjamin Yadin, Satoya Imai, Otfried Gühne
Quantum speed limits provide upper bounds on the rate with which a quantum system can move away from its initial state. Here, we provide a different kind of speed limit, describing…
Analysing quantum systems with randomised measurements
Paweł Cieśliński, Satoya Imai, Jan Dziewior +6
Measurements with randomly chosen settings determine many important properties of quantum states without the need for a shared reference frame or calibration. They naturally emerge…
Complete characterization of quantum correlations by randomized measurements
Nikolai Wyderka, Andreas Ketterer, Satoya Imai +5
The fact that quantum mechanics predicts stronger correlations than classical physics is an essential cornerstone of quantum information processing. Indeed, these quantum correlati…
Fate of multiparticle entanglement when one particle becomes classical
Zhen-Peng Xu, Satoya Imai, Otfried Gühne
We study the change of multiparticle entanglement if one particle becomes classical, in the sense that this particle is destructed by a measurement, but the gained information is e…
Work fluctuations and entanglement in quantum batteries
Satoya Imai, Otfried Gühne, Stefan Nimmrichter
We consider quantum batteries given by composite interacting quantum systems in terms of the thermodynamic work cost of local random unitary processes. We characterize quantum corr…
Optimal Entanglement Certification from Moments of the Partial Transpose
Xiao-Dong Yu, Satoya Imai, Otfried Gühne
For the certification and benchmarking of medium-size quantum devices efficient methods to characterize entanglement are needed. In this context, it has been shown that locally ran…
Statistically significant tests of multiparticle quantum correlations based on randomized measurements
Andreas Ketterer, Satoya Imai, Nikolai Wyderka +1
We consider statistical methods based on finite samples of locally randomized measurements in order to certify different degrees of multiparticle entanglement in intermediate-scale…
Effects of entanglement on vortex dynamics in the hydrodynamic representation of quantum mechanics
Satoya Imai
The hydrodynamic representation of quantum mechanics describes virtual flow as if a quantum system were fluid in motion. This formulation illustrates pointlike vortices when the ph…