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17 papers · 2 filters
Maximally incompatible quantum observables
Teiko Heinosaari, Jussi Schultz, Alessandro Toigo +1
The existence of maximally incompatible quantum observables in the sense of a minimal joint measurability region is investigated. Employing the universal quantum cloning device it…
Quantum root-mean-square error and measurement uncertainty relations
Paul Busch, Pekka Lahti, Reinhard F Werner
Recent years have witnessed a controversy over Heisenberg's famous error-disturbance relation. Here we resolve the conflict by way of an analysis of the possible conceptualizations…
Measurement uncertainty relations
Paul Busch, Pekka Lahti, Reinhard F Werner
Measurement uncertainty relations are quantitative bounds on the errors in an approximate joint measurement of two observables. They can be seen as a generalization of the error/di…
On the degree of non-Markovianity of quantum evolution
Dariusz Chruściński, Sabrina Maniscalco
We propose a new characterization of non-Markovian quantum evolution based on the concept of non-Markovianity degree. It provides an analog of a Schmidt number in the entanglement…
Heisenberg uncertainty for qubit measurements
Paul Busch, Pekka Lahti, Reinhard F Werner
Reports on experiments recently performed in Vienna [Erhard et al, Nature Phys. 8, 185 (2012)] and Toronto [Rozema et al, Phys. Rev. Lett. 109, 100404 (2012)] include claims of a v…
Coherence trapping and information back-flow in dephasing qubits
Carole Addis, Gregoire Brebner, Pinja Haikka +1
We study the interplay between coherence trapping, information back-flow and the form of the reservoir spectral density for dephasing qubits. We show that stationary coherence is m…