45 citations · 69 across the 4 of their papers we have counts for
4 papers
Positive reduction from spectra
Maria Anastasia Jivulescu, Nicolae Lupa, Ion Nechita +1
We study the problem of whether all bipartite quantum states having a prescribed spectrum remain positive under the reduction map applied to one subsystem. We provide necessary and…
Exact treatment of operator difference equations with nonconstant noncommutative coefficients
M. A. Jivulescu, A. Messina
In this paper we study in a Hilbert space a homogeneous linear second order difference equation with nonconstant and noncommuting operator coefficients. We build its exact resoluti…
Extending quantum operations
Teiko Heinosaari, Maria A. Jivulescu, David Reeb +1
For a given set of input-output pairs of quantum states or observables, we ask the question whether there exists a physically implementable transformation that maps each of the inp…
Approximating incompatible von Neumann measurements simultaneously
Teiko Heinosaari, Maria Anastasia Jivulescu, Daniel Reitzner +1
We study the problem of performing orthogonal qubit measurements simultaneously. Since these measurements are incompatible, one has to accept additional imprecision. An optimal joi…