The power of quantum computing technologies is based on the fundamentals of quantum
mechanics, such as quantum superposition, quantum entanglement, or the no-cloning …

Quantum information technologies, on the one hand, and intelligent learning systems, on the
other, are both emergent technologies that are likely to have a transformative impact on our …

Realizing a long coherence time quantum memory is a major challenge of current quantum
technology. Until now, the longest coherence-time of a single qubit was reported as 660 s in …

Gate set tomography (GST) is a protocol for detailed, predictive characterization of logic
operations (gates) on quantum computing processors. Early versions of GST emerged …

Quantum teleportation provides a way to transmit unknown quantum states from one
location to another. In the quantum world, multilevel systems which enable high-dimensional …

We perform quantum process tomography (QPT) for both discrete-and continuous-variable
quantum systems by learning a process representation using Kraus operators. The Kraus …

We present a continuous-variable experimental analysis of a two-photon Fock state of free-
propagating light. This state is obtained from a pulsed nondegenerate parametric amplifier …

Maximum-likelihood estimation is applied to the determination of an unknown quantum
measurement. The calibrated measuring apparatus carries out measurements on many …

We demonstrate the conditional reversal of a weak (partial-collapse) quantum measurement
on a photonic qubit. The weak quantum measurement causes a nonunitary transformation of …

The maximum-likelihood principle unifies inference of quantum states and processes from
experimental noisy data. Particularly, a generic quantum process may be estimated …