What is 'Orthodox' Quantum Mechanics?

David Wallace
Thursday, November 12, 2020 - 4:00pm

Abstract: What is called "orthodox'' quantum mechanics, as presented in standard foundational discussions, relies on two substantive assumptions --- the projection postulate and the eigenvalue-eigenvector link --- that do not in fact play any part in practical applications of quantum mechanics. I argue for this conclusion on a number of grounds, but primarily on the grounds that the projection postulate fails correctly to account for repeated, continuous and unsharp measurements (all of which are standard in contemporary physics) and that the eigenvalue-eigenvector link implies that...

PQI June Social Hour

Multiple Speakers
Friday, June 26, 2020 - 2:00pm

Join the PQI Director and Staff for a social hour on Friday, June 26 from 2-3pm (click here to join)!

We'll be using the platform Online Town to host a meet-up in a virtual PQI office. We won't have any food, but come chat and tell us about the trials of the spring semester, your plans for getting back into lab, how PQI could help with anything, the latest video game, or just pop in to casually see who's around. We'll be there.

Anatomy of a Photonic QPU

Eric Johnston
Tuesday, May 19, 2020 - 12:30pm

In building a full-scale QPU, problems of decoherence, scaling, manufacturability, and networking can be solved by using photons as the computational qubits. This also causes some interesting new problems, such as how to wrangle them. Starting with the notation from the Octopus Book, we'll go a bit further, to look at ridiculously-complicated graph states and measurement-based computation. Then we'll go much further, outlining a rough design for a scalable, fault-tolerant photonic QPU.

Bio: Eric R. Johnston ("EJ") (U.C. Berkeley EECS '92) is co-...

Coherent nonlinear dynamics and the physics of computation

Hideo Mabuchi
Thursday, June 11, 2020 - 3:30pm

The lecture will be livestreamed from our PQI YouTube channel [click here] and questions from the audience will be collected via the YouTube live channel chat and asked at the end.

Lecture abstract: The Coherent Ising Machine (CIM) is an emerging unconventional computing architecture for non-convex optimization....