In quantum theory, the concept of time rests on shaky ground.

In “The Present Situation in Quantum Mechanics,” his 1935 response to the famous paper by Einstein, Podolsky, and Rosen, Erwin Schrödinger coined the word “entanglement” (Verschränkung) to describe the impossibility of decomposing quantum mechanical…

The variational quantum eigensolver (VQE) is a hybrid quantum-classical algorithm for the preparation of ground states of a given problem Hamiltonian. It exploits parameterized quantum circuits (PQCs) to prepare the ansatz solutions which are…

In this talk I will present the new understanding of quantum foundations based on the concept of quantum (modular) spacetime endowed with manifest non-locality that is consistent with causality.

A well-known thought experiment is revisited in which a delocalized particle is quickly recombined while another particle probes its gravitational field. Assuming the gravitational field is quantum, some tension between causality and complementarity…

We summarize the 3 years development from an empty room to a large Doppler-cooled ytterbium cloud of a billion atoms.

Entanglement has long been recognized as a powerful resource for improving communication rates between a sender and receiver over a noisy quantum channel. But to what extent can entanglement enhance the communication rates that are achievable for a…

Naive attempts to put together relativity and quantum measurements lead to signaling between space-like separated regions. In QFT, these are known as impossible measurements.

Open quantum systems bearing transport with non-commuting conserved quantities (charges) offer the possibility to study the interplay between quantum and thermal effects. A general theory for such non-abelian transport is, however, unavailable.

The Feynman-Vernon influence functional (also known as the decoherence functional, or the Schwinger-Keldysh path integral) is a tool that appears in many forms across different areas of theoretical physics, ranging from non-equilibrium quantum field…