The advanced notebooks, mobile phones, and Internet applications in today's world that we
use are all entrenched in classical communication bits of zeros and ones. Classical Internet …

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 …

We address the study of quantum metrology enhanced by indefinite causal order,
demonstrating a quadratic advantage in the estimation of the product of two average …

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 …

Causal reasoning is essential to science, yet quantum theory challenges it. Quantum
correlations violating Bell inequalities defy satisfactory causal explanations within the …

Counter-intuitively, quantum mechanics enables quantum particles to propagate
simultaneously among multiple space-time trajectories. Hence, a quantum information …