89 citations · 258 across the 8 of their papers we have counts for
9 papers
All causally separable quantum processes are quantum circuits with classical control of causal order
Julian Wechs, Alastair A. Abbott, Cyril Branciard
The concept of causal (non)separability describes whether the causal order between parties that perform local quantum operations is well-defined or indefinite. Causal (non)separabi…
Subsystem decompositions of quantum evolutions and transformations between causal perspectives
Julian Wechs, Ognyan Oreshkov
One can theoretically conceive of processes where the causal order between quantum operations is no longer well-defined. Certain such causally indefinite processes have an operatio…
Existence of processes violating causal inequalities on time-delocalised subsystems
Julian Wechs, Cyril Branciard, Ognyan Oreshkov
It has been shown that it is theoretically possible for there to exist quantum and classical processes in which the operations performed by separate parties do not occur in a well-…
Quantum circuits with classical versus quantum control of causal order
Julian Wechs, Hippolyte Dourdent, Alastair A. Abbott +1
Quantum supermaps are transformations that map quantum operations to quantum operations. It is known that quantum supermaps which respect a definite, predefined causal order betwee…
Communication through coherent control of quantum channels
Alastair A. Abbott, Julian Wechs, Dominic Horsman +2
A completely depolarising quantum channel always outputs a fully mixed state and thus cannot transmit any information. In a recent Letter [D. Ebler et al., Phys. Rev. Lett. 120, 12…
On the definition and characterisation of multipartite causal (non)separability
Julian Wechs, Alastair A. Abbott, Cyril Branciard
The concept of causal nonseparability has been recently introduced, in opposition to that of causal separability, to qualify physical processes that locally abide by the laws of qu…
Anomalous Weak Values Without Post-Selection
Alastair A. Abbott, Ralph Silva, Julian Wechs +2
A weak measurement performed on a pre- and post-selected quantum system can result in an average value that lies outside of the observable's spectrum. This effect, usually referred…
Genuinely Multipartite Noncausality
Alastair A. Abbott, Julian Wechs, Fabio Costa +1
The study of correlations with no definite causal order has revealed a rich structure emerging when more than two parties are involved. This motivates the consideration of multipar…
Visibility of Young's interference fringes: Scattered light from small ion crystals
Sebastian Wolf, Julian Wechs, Joachim von Zanthier +1
We observe interference in the light scattered from trapped Ca ion crystals. By varying the intensity of the excitation laser, we study the influence of elastic and inel…