Meetings 2020

[ Click here for Past Meetings ]


How to attend the online meetings

If you haven’t attended these meetings before, you may need to email Mike in order to get the information needed to join: msg2mw (at) gmail.com


Sunday November 29th: Group Social

It’s been a while since we’ve just gotten together to chat. Among other things we can discuss plans for the rest of the year and beyond.


Past Meetings


Sunday November 22nd: Wayne – Advanced Eigenvalues and Eigenvectors, Part IV

https://physicscafe.org/topic/linear-algebra-for-qm-finish-talk-for-nov-22/


Sunday November 15th: Wayne – Advanced Eigenvalues and Eigenvectors, Part III

https://physicscafe.org/topic/further-linear-algebra-for-qm


Sunday November 8th: NO MEETING


Sunday November 1st: Matthew – Heisenberg Uncertainty Principle, Part III

https://physicscafe.org/topic/sunday-oct-18th-the-heisenberg-uncertainty-principle


Sunday Oct 25th: Matthew – Heisenberg Uncertainty Principle, Part II

https://physicscafe.org/topic/sunday-oct-18th-the-heisenberg-uncertainty-principle


Sunday Oct 18th: Matthew – Heisenberg Uncertainty Principle

https://physicscafe.org/topic/sunday-oct-18th-the-heisenberg-uncertainty-principle


Sunday Oct 11th: NO MEETING


Sunday October 4th: Advanced Eigenvalues and Eigenvectors, Part II

https://physicscafe.org/topic/sunday-oct-4-advanced-eigenvalues-and-eigenvectors-wrap-up-and-problem-set/


Sunday Sept 27th: Wayne – Advanced Eigenvalues and Eigenvectors

https://physicscafe.org/topic/sunday-september-27-advanced-eigenvalues-and-eigenvectors


Sunday Sept 20th: John – The Stern-Gerlach Experiment

https://physicscafe.org/topic/sunday-september-20-the-stern-gerlach-experiment


Sunday Sept 13th: Pure and Mixed States, the Density Matrix III

https://physicscafe.org/topic/pure-and-mixed-states-the-density-matrix


Sunday Sept 6th: Pure and Mixed States, the Density Matrix II

https://physicscafe.org/topic/pure-and-mixed-states-the-density-matrix


Sunday Aug 30th: Pure and Mixed States, the Density Matrix I

https://physicscafe.org/topic/pure-and-mixed-states-the-density-matrix


Sunday August 23rd: QM#6 – The Free Particle (Rescheduled)

https://physicscafe.org/topic/sunday-august-16th-the-free-particle


Sunday Aug 16th: Superdense Coding (Rescheduled)

https://physicscafe.org/topic/date-tbd-superdense-coding


Sunday August 9th: Quantum Teleportation II

https://physicscafe.org/topic/date-tbd-quantum-teleportation-i


Friday August 7th: John – Teleportation supplemental 2

https://physicscafe.org/topic/friday-august-7th-teleportation-supplemental-2/


Monday August 3rd: Teleportation supplemental

https://physicscafe.org/topic/monday-august-3rd-teleportation-supplemental/


Sunday August 2nd: Quantum Teleportation I

https://physicscafe.org/topic/date-tbd-quantum-teleportation-i


Sunday July 26th: QM#5 – 1D Position States

https://physicscafe.org/topic/sunday-july-26th-qm5-1d-position-states


Sunday July 19th: Linearity and the No Cloning Theorem

https://physicscafe.org/topic/date-tbd-linearity-and-the-no-cloning-theorem


Tuesday July 14th: QM#4 – Schrödinger’s Equation

https://physicscafe.org/topic/quantum-mechanics-4-schrdingers-equation/


Sunday July 12th: Multi-Bit Operations

https://physicscafe.org/topic/sunday-july-12-multi-bit-operations


Sunday July 5th: The Bell States

https://physicscafe.org/topic/sunday-july-5th-the-bell-states
There is homework to do before the meeting!


Tuesday June 30: QM#3 – Background on Differential Equations

https://physicscafe.org/topic/tuesday-june-30th-qm3-differential-equations/


Sunday, 28 June: Continue on the Tensor Product (Section 8)

https://physicscafe.org/topic/sunday-21-june-starting-on-quantum-information
(I’ll keep using the same entry in the meeting forum for now.)


Tuesday June 23rd: QM#2 Transition from discrete to continuous space

https://physicscafe.org/topic/quantum-mechanics-2-transition-from-discrete-to-continuous/


Sunday, 21 June: Starting on Quantum Information

https://physicscafe.org/topic/sunday-21-june-starting-on-quantum-information


Tuesday June 16th: QM#1 Orientation

https://physicscafe.org/topic/quantum-mechanics-1-orientation/


Sunday June 14th: Electron Spin II

We’ll be working exercises together.
https://physicscafe.org/topic/sunday-june-14th-electron-spin-ii


Tuesday June 9th: SR/GR III

https://physicscafe.org/topic/tuesday-june-acceleration-in-sr-finish/


Sunday June 7th: Electron Spin

Today we’ll start on quantum theory, with section 6 on Electron Spin.
https://physicscafe.org/topic/sunday-june-7th-electron-spin


Sunday May 31st: Group Social

We’re finished reviewing math concepts and next week we’ll start on quantum theory. So this seems like a good time to get together and just chat: Sunday-31-may-group-social.
Note the link which you may not have used before.


Tuesday May 26th: SR/GR II

Wayne is doing a three-part series on special and general relativity.
https://physicscafe.org/topic/tuesday-may-19-acceleration-in-sr-and-geodsics-in-the-rindler-metric/


Sunday May 24th: Complex Vector Spaces

Eduard will go over section 4 on Complex Vector Spaces.
https://physicscafe.org/topic/sunday-may-24th-complex-vector-spaces/


Tuesday May 19th: SR/GR I

Wayne is doing a three-part series on special and general relativity.
https://physicscafe.org/topic/tuesday-may-19-acceleration-in-sr-and-geodsics-in-the-rindler-metric/


Sunday May 17th: Complex Numbers

John went over Section 3 on Complex Numbers.


Tuesday May 12th: Website Status / Q&A

There’s more information in the meeting forum. If you don’t have access to that, email Mike.


Sunday May 10th: Matrices

John covered section 2 on Matrices. Pages 14 through 17. This is only four pages, but there is a lot of material here, covering: matrix multiplication, the transpose operation, the identity matrix, inverses, eigenvalues, eigenvectors, and more.


Tuesday May 5th: The Geodesic Equation

This is an advanced topic, which will probably be of interest only to people who have some knowledge of both General Relativity and programming in Python.

The original intent of this meeting was to go over some work I did last year, attempting to use the geodesic equation (numerically) to plot a uniform acceleration path. This was done in Python. Also, the metric tensor from which this particular equation came was taken (somewhat naively) directly from one of Leonard Susskind’s lectures.

Here’s the write-up of this from a meeting of the Denver group last year

Since the meeting was originally scheduled, some things have happened:

(1) Wayne, in Vancouver reviewed the Susskind lecture and thinks that perhaps the metric tensor he gave was simplified to the point that it doesn’t actually represent acceleration relativistically. (Wayne, let me know if I’m misquoting you!)

(2) Tim in Portland found this package: einsteinpy.org
which appears to be very pertinent to what we’re trying to do here. Nobody has had time to look at it in depth, but Tim might have something to report.

(3) I’ve reviewed my code from last year and I’ve realized that it will not be easy to get it into a “sharable” form, for the purposes of this meeting. It turns out that it’s too dependent a library I’d been putting together to draw space-time (Minkowski) diagrams and I just don’t have the time to pull out the relevant code and make it stand-alone. The spacetime diagram library in itself might be interesting, but that’s a topic that would take some time.

So … what I’m suggesting at this point, is that we have a short get together for anyone who is interested in numerical work with GR, and just discuss our interests and options. I’ll also briefly describe that I was trying to do if anyone is interested.

For those who are interested SR/GR but not in numerics, Wayne has a couple of lectures scheduled later in the month. More information on those will be appearing soon!


Sunday May 3rd: More on Vectors

3:00pm US/CA West Coast Time
References: Notes.pdf, Study Plan
Attending: Buck, David, Eduard, Eugen, Joel, John, Mary Ann, Polly, Sharon, Terrill, Tina, Wayne

John covered the remainder of the section on Vectors, pages 11, 12, and 13. Even though there are only three pages, this material (especially change of basis) requires a lot of explanation.

I put the video in the Meetings Forum.


Sunday April 26th: Vectors

References: Notes.pdf, Other references
Attending: David, Eugen, Joel, John, Mary Ann, Mike, Sharon, Terrill, Tina, Wayne, B., Wayne D.,

We covered the first 10 pages of the notes. We’ll we’ll finish section 1 on vectors next week.


Saturday April 25th: Python Notebook Workshop

This is for people who would like some help setting up and running the group’s Python (or Jupyter) notebooks.

Attending: David, Eugen, Joel, John, Mike, Wayne B., Wayne D.

I attempted to record the meeting, but at some point Zoom kicked me off and I had to rejoin. It appears that the recording was lost at that point.

Also, here is a tutorial on Jupyter notebooks from 2016:
https://www.youtube.com/watch?v=HW29067qVWk
Some parts may be dated, but it could be useful as a compliment to this meeting, for those that are interested.


19 April: First official Physics Cafe meeting

References

People attending (and please let me know if I have your location wrong!)
Vancouver, BC: Alf, Wayne D.
Rochester, NY: Bert
Portland, OR: David, Eugen, Sharon
Boulder, CO: Eduard, John
Denver, CO: Mike, Tina
Willimantic, CT: Wayne B.

The purpose of this meeting was to discuss the possibility of an online study group to start from a very basic level, go through some of the principles of discrete quantum theory (quantum information) and then go on to tackle the continuous theory (quantum mechanics).

We agreed to start off with this study plan at least as a tentative guide.


2019 Meetings