[MUSIC PLAYING]
STEPHANIE WEHNER: How do you share
a secret when anyone can listen in?
Cryptography is the art of secrecy.
Quantum cryptography exploits
the laws of quantum mechanics
to obtain security.
THOMAS VIDICK: But why Quantum?
Why use Quantum to
transmit classical secrets?
Quantum is weird.
How is it useful?
Do Quantum bits hide their contents
better than classical bits?
And what about Quantum entanglement?
STEPHANIE WEHNER: Undoubtedly,
the most famous application
of Quantum cryptography is
Quantum Key Distribution, QKD.
QKD allows Alice and Bob
to generate a secure key
that they can use to protect
their messages even while everyone
is trying to listen in.
QKD is already commercially
available today over short distances.
We are working towards
a Quantum internet
to enable Quantum communication
between any two points on earth.
THOMAS VIDICK: Quantum
cryptography is much more than QKD.
Quantum communication can be used
to make unbreakable promises.
Once you commit, there is no escaping.
You are bound by the laws of physics.
STEPHANIE WEHNER: My
name is Stephanie Wehner,
and I'm an Associate Professor at
QuTech, Delft University of Technology.
THOMAS VIDICK: My name is Thomas Vidick.
I am an Assistant Professor in
Computing and Mathematical Sciences
at the California
Institute of Technology.
STEPHANIE WEHNER: In
this online course, we
will be teaching you the
fundamentals of Quantum cryptography.
THOMAS VIDICK: We will teach
you what is actually a secret.
Think about it.
STEPHANIE WEHNER: What
does it even mean for Eve
to be ignorant about the secret?
THOMAS VIDICK: After successfully
mastering this course,
you will be ready to enter this
exciting new field of research.
STEPHANIE WEHNER: The future
of cryptography is Quantum.
Join us and learn how.
[MUSIC PLAYING]
