BLOOOPPS

1) BRIDGE: “hook” or introductory activity
Ask students, what can you do with light?
You can send secret messages with light!
2) Teaching OBJECTIVES:
Have everyone involve in the active learning / the game.
3) Learning OBJECTIVES: “SWBAT” 
Students will be able to relate eigenvectors to the polarization vectors of light and the implications.
Students will be able to relate measurement as a matrix acting on a vector.
SWABAT explain that measurement on light will change the polarization unless it is already an eigenvector.
4) PRETEST: Ask orally about understanding of light and quantum mechanics.
5) PARTICIPATORY
Lay down ground work rules on light.
Explain how Alice and Bob (Quantum Cryptographic System) work.
Get students to pretend / role play Alice and Bob.
Ask what information is being sent classically vs what information is kept as the message.
6) POST-TEST
Ask students one by one what they learned.
Key questions:
What about measurement allows for light to be a medium for sending secret messages?
What is the classical (verbal) information that is communicated through between Alice and Bob?
What is this information used for?
What part of light does the message information come from?
7) SUMMARY or conclusion
Alice and Bob are actual machines of a quantum cryptographic system. Such systems exist and were used in the Swiss 2007 election to encrypt the ballots.