Once upon a time, it required state of the art quantum optics to perform a teleportation experiment. Now we can do it with a regular quantum computer. Here I teleport from the start to the end of a chain of 17 superconducting qubits, using a quantum computer created by IBM Quantum (thanks IBM for the… Continue reading Teleportation across a Quantum Computer Chip

# News

## Conservation Laws For Every Quantum Measurement Outcome

In Quantum Mechanics, a cylinder can simultaneously rotate clockwise and anti-clockwise at the same time. This phenomenon, called superposition, is crucial for paradoxes like SchrÃ¶dinger’s cat, and applications such as Quantum Computing. If we measure which way the cylinder rotates, we will find it to be clockwise or anti-clockwise. This gives us a paradox, as… Continue reading Conservation Laws For Every Quantum Measurement Outcome

## Angular Momentum Flows without anything carrying it

Yakir Aharonov, Sandu Popescu and I have written a new paper where we show how Angular Momentum, a conserved quantity, can travel from one place to another across a region of space which is empty except for a vanishingly small probability of containing a particle. Remarkably, this probability, which can be made as small as… Continue reading Angular Momentum Flows without anything carrying it

## Foundations 2023 Conference Talk

I gave a talk on Teleportation of Post-Selected States (and how do I know an entangled state is what I think it is) at the Foundations of Physics 2023 Conference in Bristol. The slides for the talk are below. This was an excellent conference organised by the philosophy of physics department which brought together physicists… Continue reading Foundations 2023 Conference Talk

## Teleportation of Post-Selected States

I’ve written a new paper showing how to teleport a state which is post-selected. This combines three of my favourite topics: teleportation, post-selection, and the reality of an a non-local quantum state. My final result gives a simplified measurement for checking that a shared entangled state is really “in” that state at a given time,… Continue reading Teleportation of Post-Selected States

## Classical to Quantum Non-Signalling Boxes

CM Ferrera, R Simmons, J Purcell, S Popescu and I have written a new paper where we define and study C-Q boxes. A C-Q box is shared across many parties, each of which can enter a classical input and receive a quantum state as output. These boxes are defined to be non-signalling: they do not… Continue reading Classical to Quantum Non-Signalling Boxes