My first quantum protocol

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What did you learn last week?
In the last few weeks you completed your basic training. You now know about quantum information, how to write it, how to read it, and how to dial it up to 11 with entanglement. Entangled states were those that could not be written as product states (in any basis!). With multiqubit states and gates, you have all the tools you need to start creating quantum algorithms.
What will you learn this week?
This week you will be introduced to the first two canonical quantum protocols: superdense coding and teleportation. These demonstrate that entanglement can be used as a resource for some tasks. You’ll have your first taste as designing protocols as well as analysing them.
What will you be able to do at the end of this week 5?
At the end of this module, you should be able to answer these questions:
What is superdense coding?
What is quantum teleportation?
What is entanglement swapping?
How is entanglement a useful resource?

Superdense coding by design

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Play with this circuit on Quirk.

Quantum teleportation

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Play with this circuit on Quirk.
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https://xkcd.com/465/
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Play with this circuit on Quirk.
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Play with this circuit on Quirk.

Additional Resources

Quantum theorist by day, father by night. Occasionally moonlights as a children’s book author. www.csferrie.com @csferrie

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