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 …

Quantum metrology pursues the physical realization of higher‐precision measurements to
physical quantities than the classically achievable limit by exploiting quantum features, such …

We experimentally probe the interplay of the quantum switch with the laws of
thermodynamics. The quantum switch places two channels in a superposition of orders and …

Critical quantum metrology relies on the extreme sensitivity of a system's eigenstates near
the critical point of a quantum phase transition to Hamiltonian perturbations. This means that …

Quantum theory allows the traversing of multiple channels in a superposition of different
orders. When the order in which the channels are traversed is controlled by an auxiliary …

The quantum switch, the canonical example of a process with indefinite causal order, has
been claimed to provide various advantages over processes with definite causal orders for …

Quantum correlations, like entanglement, represent the characteristic trait of quantum
mechanics, and pose essential issues and challenges to the interpretation of this pillar of …

The release of the causal structure of physical events from a well-defined order to an
indefinite order stimulates remarkable enhancements in various quantum information tasks …

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 theory allows information to flow through a single device in a coherent
superposition of two opposite directions, resulting into situations where the input-output …