40 citations · 148 across the 12 of their papers we have counts for
12 papers
On the simulation of quantum multimeters
Andreas Bluhm, Leevi Leppäjärvi, Ion Nechita
In the quest for robust and universal quantum devices, the notion of simulation plays a crucial role, both from a theoretical and from an applied perspective. In this work, we go b…
Generating random Gaussian states
Leevi Leppäjärvi, Ion Nechita, Ritabrata Sengupta
We develop a method for the random sampling of (multimode) Gaussian states in terms of their covariance matrix, which we refer to as a random quantum covariance matrix (RQCM). We a…
Simple Information Processing Tasks with Unbounded Quantum Advantage
Teiko Heinosaari, Oskari Kerppo, Leevi Leppäjärvi +1
Communication scenarios between two parties can be implemented by first encoding messages into some states of a physical system which acts as the physical medium of the communicati…
Semi-device-independent certification of number of measurements
Isadora Veeren, Martin Plávala, Leevi Leppäjärvi +1
We develop a method for semi-device-independent certification of number of measurements. We achieve this by testing whether Bob's steering equivalent observables (SEO) can be simul…
Incompatibility of quantum instruments
Leevi Leppäjärvi, Michal Sedlák
Quantum instruments describe outcome probability as well as state change induced by measurement of a quantum system. Incompatibility of two instruments, i. e. the impossibility to…
Random access test as an identifier of nonclassicality
Teiko Heinosaari, Leevi Leppäjärvi
Random access codes are an intriguing class of communication tasks that reveal an operational and quantitative difference between classical and quantum information processing. We f…
Post-processing of quantum instruments
Leevi Leppäjärvi, Michal Sedlák
Studying sequential measurements is of the utmost importance to both the foundational aspects of quantum theory and the practical implementations of quantum technologies, with both…
Operational restrictions in general probabilistic theories
Sergey N. Filippov, Stan Gudder, Teiko Heinosaari +1
The formalism of general probabilistic theories provides a universal paradigm that is suitable for describing various physical systems including classical and quantum ones as parti…
Phase covariant qubit dynamics and divisibility
S. N. Filippov, A. N. Glinov, L. Leppäjärvi
Phase covariant qubit dynamics describes an evolution of a two-level system under simultaneous action of pure dephasing, energy dissipation, and energy gain with time-dependent rat…
Entanglement Protection via Periodic Environment Resetting in Continuous Time Quantum Dynamical Processes
Thomas Bullock, Francesco Cosco, Marwan Haddara +8
The temporal evolution of entanglement between a noisy system and an ancillary system is analyzed in the context of continuous time open quantum system dynamics. Focusing on a coup…
No-free-information principle in general probabilistic theories
Teiko Heinosaari, Leevi Leppäjärvi, Martin Plávala
In quantum theory, the no-information-without-disturbance and no-free-information theorems express that those observables that do not disturb the measurement of another observable…
A necessary condition for incompatibility of observables in general probabilistic theories
Sergey Filippov, Teiko Heinosaari, Leevi Leppäjärvi
We quantify the intrinsic noise content of an observable in a general probabilistic theory and derive a noise content inequality for incompatible observables. We apply the derived…