Quantum teleportation is one of the most important protocols in quantum information. By
exploiting the physical resource of entanglement, quantum teleportation serves as a key …

Any physical process can be represented as a quantum channel mapping an initial state to a
final state. Hence it can be characterized from the point of view of communication theory, ie …

The idea that events obey a definite causal order is deeply rooted in our understanding of
the world and at the basis of the very notion of time. But where does causal order come from …

We show that quantum theory allows for transformations of black boxes that cannot be
realized by inserting the input black boxes within a circuit in a predefined causal order. The …

Quantum teleportation is essential for many quantum information technologies, including
long-distance quantum networks. Using fiber-coupled devices, including state-of-the-art low …

We propose a conceptual design for a quantum blockchain. Our method involves encoding
the blockchain into a temporal GHZ (Greenberger–Horne–Zeilinger) state of photons that do …

In this work, we address fundamental limitations of quantum teleportation—the process of
transferring quantum information using classical communication and preshared …

Traditionally, quantum theory assumes the existence of a fixed background causal structure.
But if the laws of quantum mechanics are applied to the causal relations, then one could …

We construct a metrology experiment in which the metrologist can sometimes amend the
input state by simulating a closed timelike curve, a worldline that travels backward in time …

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 …