Experimental aspects of indefinite causal order in quantum mechanics
In the past decade, the toolkit of quantum information has been expanded to include
processes in which the basic operations do not have definite causal relations. Originally …
processes in which the basic operations do not have definite causal relations. Originally …
Experiments on quantum causality
Quantum causality extends the conventional notion of the fixed causal structure by allowing
channels and operations to act in an indefinite causal order. The importance of such an …
channels and operations to act in an indefinite causal order. The importance of such an …
Experimental quantum communication enhancement by superposing trajectories
In quantum communication networks, wires represent well-defined trajectories along which
quantum systems are transmitted. In spite of this, trajectories can be used as a quantum …
quantum systems are transmitted. In spite of this, trajectories can be used as a quantum …
Cyclic quantum causal models
Causal reasoning is essential to science, yet quantum theory challenges it. Quantum
correlations violating Bell inequalities defy satisfactory causal explanations within the …
correlations violating Bell inequalities defy satisfactory causal explanations within the …
Embedding cyclic causal structures in acyclic spacetimes: no-go results for process matrices
Causality can be defined in terms of a space-time structure or based on information-theoretic
structures, which correspond to very different notions of causation. When analysing physical …
structures, which correspond to very different notions of causation. When analysing physical …
Embedding cyclic information-theoretic structures in acyclic space-times: No-go results for indefinite causality
The notions of causality adopted within the quantum information and space-time physics
communities are distinct. Although experience tells us that these notions play together in a …
communities are distinct. Although experience tells us that these notions play together in a …
Computational advantage from the quantum superposition of multiple temporal orders of photonic gates
Models for quantum computation with circuit connections subject to the quantum
superposition principle have recently been proposed. In them, a control quantum system can …
superposition principle have recently been proposed. In them, a control quantum system can …
Time-delocalized quantum subsystems and operations: on the existence of processes with indefinite causal structure in quantum mechanics
O Oreshkov - Quantum, 2019 - quantum-journal.org
It has been shown that it is theoretically possible for there to exist higher-order quantum
processes in which the operations performed by separate parties cannot be ascribed a …
processes in which the operations performed by separate parties cannot be ascribed a …
Computational advantage from a quantum superposition of qubit gate orders
In an ordinary quantum algorithm the gates are applied in a fixed order on the systems. The
introduction of indefinite causal structures allows us to relax this constraint and control the …
introduction of indefinite causal structures allows us to relax this constraint and control the …
Quantum theory cannot violate a causal inequality
Within quantum theory, we can create superpositions of different causal orders of events,
and observe interference between them. This raises the question of whether quantum theory …
and observe interference between them. This raises the question of whether quantum theory …