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Experimental Superposition of Orders of Quantum Gates
Lorenzo M. Procopio, Amir Moqanaki, Mateus Araújo +7
In a quantum computer, creating superpositions of quantum bits (qubits) in different states can lead to a speed-up over classical computers [1], but quantum mechanics also allows f…
A graph-separation theorem for quantum causal models
Jacques Pienaar, Caslav Brukner
A causal model is an abstract representation of a physical system as a directed acyclic graph (DAG), where the statistical dependencies are encoded using a graphical criterion call…
Bounding quantum correlations with indefinite causal order
Caslav Brukner
Causal inequalities are bounds on correlations obtained when operations take place in a causal sequence, i.e. in which the background time or definite causal structure pre-exists s…
Computational advantage from quantum-controlled ordering of gates
Mateus Araújo, Fabio Costa, Časlav Brukner
It is usually assumed that a quantum computation is performed by applying gates in a specific order. One can relax this assumption by allowing a control quantum system to switch th…