Photons have been a flagship system for studying quantum mechanics, advancing quantum
information science, and developing quantum technologies. Quantum entanglement …

In recent years, there has been a rising interest in high‐dimensional quantum states and
their impact on quantum communication. Indeed, the availability of an enlarged Hilbert …

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 …

Time has a fundamentally different character in quantum mechanics and in general relativity.
In quantum theory events unfold in a fixed order while in general relativity temporal order is …

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 …

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 …

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

Classically, no information can be transmitted through a depolarising, which is a completely
noisy, channel. We show that by combining a depolarising channel with another channel in …