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quant-ph2020
Quantifying causal influences in the presence of a quantum common cause
Mariami Gachechiladze, Nikolai Miklin, Rafael Chaves
Quantum mechanics challenges our intuition on the cause-effect relations in nature. Some fundamental concepts, including Reichenbach's common cause principle or the notion of local…
quant-ph2018
Changing the circuit-depth complexity of measurement-based quantum computation with hypergraph states
Mariami Gachechiladze, Otfried Gühne, Akimasa Miyake
While the circuit model of quantum computation defines its logical depth or "computational time" in terms of temporal gate sequences, the measurement-based model could allow totall…
quant-ph2018
The structure of ultrafine entanglement witnesses
Mariami Gachechiladze, Nikolai Wyderka, Otfried Gühne
An entanglement witness is an observable with the property that a negative expectation value signals the presence of entanglement. The question arises how a witness can be improved…