What is a quantum coin toss?

The video explores a problem in quantum cryptography: flipping a coin over the phone. It highlights the issues with classical coin flipping and introduces a quantum solution using wavefunction collapse and polarization. The video explains how photons can be used to ensure fairness in a coin flip between two untrusting parties. It demonstrates the concept of wavefunction collapse with polarizing filters and details a protocol for a quantum coin flip. The video concludes with a discussion on the impossibility of cheating in this system and provides links to further resources.

What is the main problem with flipping a coin over the phone?

• One party might cheat.

• The coin might get lost.

• The coin might not land properly.

• The phone might not have enough battery.

What does wavefunction collapse refer to in quantum physics?

• The destruction of a quantum object.

• The stabilization of a quantum object.

• The creation of a new quantum object.

• The change in a quantum object upon measurement.

How does a vertical polarizing filter affect light?

• It changes the color of the light.

• It allows only horizontally polarized light to pass.

• It blocks all light.

• It allows only vertically polarized light to pass.

What happens when light passes through a filter at a 45-degree angle to its polarization?

• All light is blocked.

• All light passes through.

• Half the light passes through randomly.

• The light changes color.

What is the purpose of using polarizing filters in the quantum coin flip protocol?

• To make the photons visible.

• To change the color of the photons.

• To encode a random sequence of ones and zeros.

• To ensure the photons travel faster.

How does Jade determine the sequence of ones and zeros in the quantum coin flip?

• By guessing the sequence.

• By measuring the photons with random filters.

• By using a computer program.

• By using a random number generator.

Why is it impossible to cheat in the quantum coin flip protocol?

• Because the photons are invisible.

• Because the protocol is too complex.

• Because the protocol uses a large number of photons.

• Because the sequence is too short.