Single Measurement

[weiting wang]

Hi,

I want to simulate single measurement on a quantum state.

In another word, If I single measure (|g>+|e>)/sqrt(2), I will get either |g> or |e> otherwise the expectation 0.5 of |g> and 0.5 of |e>.

I want to get the expectation by myself after a lot of single measurement.

How can I real single measurement.

Thank you very much !

[Andrew Dawes]

There is not a builtin way to do this but you can generate s dataset with given probabilities that match the state. This notebook has an example of what I mean:

https://github.com/amcdawes/QMlabs/blob/master/Lab%204%20-%20Measurements.ipynb

Andy

Sent from my phone using voice-recognition software and/or clumsy thumbs, please forgive any typos.

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[Andrew M.C. Dawes]

Just because I had been wanting to work this up for my class anyway, here is a sample notebook that defines a function called: simulateData that does what you want (I believe):

http://nbviewer.jupyter.org/github/amcdawes/QMlabs/blob/master/Simulating%20measurements.ipynb

Hope it works for you and for anyone else using QuTiP to teach (it’s great for this by the way!)

Andy

[liuk...@gmail.com]

Hi,

I want to simulate single measurement on a quantum state.

In another word, if I single measure on a superposition (|g>+|e>)/sqrt(2), I will get either |g> or |e>. I don't want to get an expectation.

After a lot of single measurement, I get the probability of |g> .

How can I real this function?

Thank you very much.

[Alex Pitchford]

Very nice notebook.

Also very pleased to hear you promoting QuTiP as teaching aid.

 

Thank you

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[weiting wang]

Thank you very much!

I will learn the notebook and hope to communicate with you later.

Weiting 

在 2016年2月18日星期四 UTC+8下午9:54:18，weiting wang写道：

[Andrew Dawes]

Thanks, and feel free to browse or share the whole repo:

https://github.com/amcdawes/QMlabs

It follows a specific text but should provide a reasonable overview of how to do lots of basic stuff in QuTiP (kind of a student-level precursor to the existing qutip notebooks).

Best

Andy

Sent from my phone using voice-recognition software and/or clumsy thumbs, please forgive any typos.

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[Alex Pitchford]

Andrew,

I could link your notebooks from the QuTiP tutorials page if you like?

btw have you seen to 'binder' service for interactively hosting notebooks.

You can link to the QuTiP one from the github now.

Alex

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[Andrew M.C. Dawes]

On Feb 18, 2016, at 8:57 PM, Alex Pitchford <alex.pi...@gmail.com> wrote:

Andrew,

I could link your notebooks from the QuTiP tutorials page if you like?

Sure, I have made them fairly “publication ready” in terms of being tidy and self-explanatory

btw have you seen to 'binder' service for interactively hosting notebooks.

You can link to the QuTiP one from the github now.

I did play around with it but I didn’t fully appreciate what it can do until seeing all of the QuTiP demos. Binder may actually be a great way to host stuff for a course where students could individually work through a notebook at their own pace without needing a full python stack.

Thanks!

Andy

[Alex Pitchford]

Yes, when I saw the binder, I did think that the educational use would be great. Save students having any excuse about not be able to get the library working :) Not sure if they can save individual checkpoints though? Maybe they don't need to for the homework

 

[Chris Granade]

Wow, those lectures look great!  I'm really happy to see QuTiP get used in education, thanks for sharing your notebooks!
--Chris