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quant-ph2021
Confident entanglement detection via separable numerical range
Timo Simnacher, Jakub Czartowski, Konrad Szymański +1
We investigate the joint (separable) numerical range of multiple measurements, i.e., the regions of expectation values accessible with (separable) quantum states for given observab…
quant-ph2021
Universal witnesses of vanishing energy gap
Konrad Szymański, Karol Życzkowski
Energy gap, the difference between the energy of the ground state of a given Hamiltonian and the energy of its first excited state, is a parameter of a critical importance in analy…