Summary:

• **What is Quantum Key Distribution?** Scientists have figured out how to send secret codes over really long distances (62 miles!) using special particles of light called photons. These secret codes are so secure that hackers cannot break them, even with super powerful computers, because they use the strange rules of quantum physics.

• **Why is This Important?** This new method works with regular fiber optic cables (the same cables that bring internet to homes) and doesn't need special trusted devices to keep the information safe. This means banks, hospitals, and governments could protect their most important secrets much more easily and cheaply in the future.