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quant-ph2020
Programmability of covariant quantum channels
Martina Gschwendtner, Andreas Bluhm, Andreas Winter
A programmable quantum processor uses the states of a program register to specify one element of a set of quantum channels which is applied to an input register. It is well-known t…
quant-ph2018
Compatibility of quantum measurements and inclusion constants for the matrix jewel
Andreas Bluhm, Ion Nechita
In this work, we establish the connection between the study of free spectrahedra and the compatibility of quantum measurements with an arbitrary number of outcomes. This generalize…
quant-ph2018
Joint measurability of quantum effects and the matrix diamond
Andreas Bluhm, Ion Nechita
In this work, we investigate the joint measurability of quantum effects and connect it to the study of free spectrahedra. Free spectrahedra typically arise as matricial relaxations…