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 …

In the standard quantum theory, the causal order of occurrence between events is
prescribed, and must be definite. This has been maintained in all conventional scenarios of …

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 mechanics is compatible with scenarios where the relative order between two
events can be indefinite. Here we show that two independent instances of a noisy process …

Understanding the interface between quantum and relativistic theories is crucial for
fundamental and practical advances, especially given that key physical concepts such as …

We propose a thermodynamic refrigeration cycle which uses indefinite causal orders to
achieve nonclassical cooling. The cycle cools a cold reservoir while consuming purity in a …

This tutorial introduces a systematic approach for addressing the key question of quantum
metrology: For a generic task of sensing an unknown parameter, what is the ultimate …

Quantum supermaps are transformations that map quantum operations to quantum
operations. It is known that quantum supermaps which respect a definite, predefined causal …

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 …

A series of recent works has shown that placing communication channels in a coherent
superposition of alternative configurations can boost their ability to transmit information …