225 citations · 1.2k across the 34 of their papers we have counts for
34 papers
Cloning Quantum Channels
Pavel Sekatski, Yelena Guryanova, Naga Bhavya Teja Kothakonda +1
We consider the problem of deterministically cloning quantum channels with respect to the best attainable rate and the highest quality, so-called optimal cloning. We demonstrate th…
Quantum sensing of a quantum field
Ricard Ravell Rodríguez, Martí Perarnau-Llobet, Pavel Sekatski
Estimating a classical parameter encoded in the Hamiltonian of a quantum probe is a fundamental and well-understood task in quantum metrology. A textbook example is the estimation…
The entropic coherence is a necessary resource for non-energy preserving gates
Riccardo Castellano, Vasco Cavina, Marti Perarnau-Llobet +2
We consider the task of implementing non-energy preserving gates (NEPG) on a finite-dimensional system S via an energy-preserving interaction with an external battery B. We prove t…
On the entropy growth of sums of iid discrete random variables
Riccardo Castellano, Pavel Sekatski
We derive an asymptotic lower bound on the Shannon entropy of sums of arbitrary iid discrete random variables. The derived bound …
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…
Exact requirements for battery-assisted qubit gates
Riccardo Castellano, Vasco Cavina, Martí Perarnau-Llobet +2
We consider the implementation of a unitary gate on a qubit system S via a global energy-preserving operation acting on S and an auxiliary system B that can be seen as a battery. W…
Selective and noise-resilient wave estimation with quantum sensor networks
Arne Hamann, Paul Aigner, Pavel Sekatski +1
We consider the selective sensing of planar waves in the presence of noise. We present different methods to control the sensitivity of a quantum sensor network, which allow one to…
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…
Quantum computation with logical gates between hot systems
Ferran Riera-Sàbat, Pavel Sekatski, Wolfgang Dür
We consider quantum computer architectures where interactions are mediated between hot qubits that are not in their mechanical ground state. Such situations occur, e.g., when not c…
Designing optimal protocols in Bayesian quantum parameter estimation with higher-order operations
Jessica Bavaresco, Patryk Lipka-Bartosik, Pavel Sekatski +1
Using quantum systems as sensors or probes has been shown to greatly improve the precision of parameter estimation by exploiting unique quantum features such as entanglement. A maj…
Optimal distributed multiparameter estimation in noisy environments
Arne Hamann, Pavel Sekatski, Wolfgang Dür
We consider the task of multiple parameter estimation in the presence of strong correlated noise with a network of distributed sensors. We study how to find and improve noise-insen…
Partial self-testing and randomness certification in the triangle network
Pavel Sekatski, Sadra Boreiri, Nicolas Brunner
Quantum nonlocality can be demonstrated without inputs (i.e. each party using a fixed measurement setting) in a network with independent sources. Here we consider this effect on ri…
A Quantum Simulator Based on Locally Controlled Logical Systems
Ferran Riera-Sàbat, Pavel Sekatski, Wolfgang Dür
In a digital quantum simulator, basic two-qubit interactions are manipulated by means of fast local control operations to establish a desired target Hamiltonian. Here we consider a…
Remotely Controlled Entanglement Generation
Ferran Riera-Sàbat, Pavel Sekatski, Wolfgang Dür
We consider a system of multiple qubits without any quantum control. We show that one can mediate entanglement between different subsystems in a controlled way by adding a (locally…
Experimental quantum key distribution certified by Bell's theorem
D. P. Nadlinger, P. Drmota, B. C. Nichol +12
Cryptographic key exchange protocols traditionally rely on computational conjectures such as the hardness of prime factorisation to provide security against eavesdropping attacks.…
Optimal nonequilibrium thermometry in Markovian environments
Pavel Sekatski, Martí Perarnau-Llobet
What is the minimum time required to take a temperature? In this paper, we solve this question for a large class of processes where temperature is inferred by measuring a probe (th…
Approximate decoherence free subspaces for distributed sensing
Arne Hamann, Pavel Sekatski, Wolfgang Dür
We consider the sensing of scalar valued fields with specific spatial dependence using a network of sensors, e.g. multiple atoms located at different positions within a trap. We sh…
Control of Stochastic Quantum Dynamics by Differentiable Programming
Frank Schäfer, Pavel Sekatski, Martin Koppenhöfer +2
Control of the stochastic dynamics of a quantum system is indispensable in fields such as quantum information processing and metrology. However, there is no general ready-made appr…
Noisy distributed sensing in the Bayesian regime
S. Wölk, P. Sekatski, W. Dür
We consider non-local sensing of scalar signals with specific spatial dependence in the Bayesian regime. We design schemes that allow one to achieve optimal scaling and are immune…
Optimal distributed sensing in noisy environments
Pavel Sekatski, Sabine Wölk, Wolfgang Dür
We consider distributed sensing of non-local quantities. We introduce quantum enhanced protocols to directly measure any (scalar) field with a specific spatial dependence by placin…
All macroscopic quantum states are fragile and hard to prepare
Andrea López-Incera, Pavel Sekatski, Wolfgang Dür
We study the effect of local decoherence on arbitrary quantum states. Adapting techniques developed in quantum metrology, we show that the action of generic local noise processes -…
Macroscopic quantum states: measures, fragility and implementations
Florian Fröwis, Pavel Sekatski, Wolfgang Dür +2
Large-scale quantum effects have always played an important role in the foundations of quantum theory. With recent experimental progress and the aspiration for quantum enhanced app…
Macroscopic superpositions require tremendous measurement devices
M. Skotiniotis, W. Dür, P. Sekatski
We consider fundamental limits on the detectable size of macroscopic quantum superpositions. We argue that a full quantum mechanical treatment of system plus measurement device is…