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Showing 2021 · quant-phShow all
3 papers · 2 filters
quant-ph2021★ 3 cited
Uncertainties in Quantum Measurements: A Quantum Tomography
A. P. Balachandran, F. Calderón, V. P. Nair +3
The observables associated with a quantum system form a non-commutative algebra . It is assumed that a density matrix can be determined from the expectation…
quant-ph2021★ 11 cited
Formal Aspects of Quantum Decay
D. F. Ramírez Jiménez, N. G. Kelkar
The Fock-Krylov formalism for the calculation of survival probabilities of unstable states is revisited paying particular attention to the mathematical constraints on the density o…
quant-ph2021★ 3 cited
Uhlmann Fidelity and Fidelity Susceptibility for Integrable Spin Chains at Finite Temperature: Exact Results
Michał Białończyk, Fernando Javier Gómez-Ruiz, Adolfo del Campo
We derive the exact expression for the Uhlmann fidelity between arbitrary thermal Gibbs states of the quantum XY model in a transverse field with finite system size. Using it, we c…