92. Quantum Communication: A New Way to Share Information

What is the main advantage of quantum communication over normal communication methods like phone calls or emails?
1. It is much faster and can send more data.
2. It uses satellites to work over very long distances.
3. It provides a unique and higher level of security.
4. It is simpler and cheaper to build and maintain.
According to the essay, what is "quantum entanglement"?
1. A method for sending information using electrical signals.
2. The process of launching satellites for global communication.
3. A special link between particles where a change in one instantly affects the other.
4. A type of code that is difficult for computers to break.
How does Quantum Key Distribution (QKD) ensure that a secret key hasn't been intercepted?
1. It sends the key through a heavily encrypted email.
2. It uses a powerful computer to constantly change the key.
3. Any attempt to spy on the key will change the quantum particles and alert the users.
4. It only works over very short distances where spying is impossible.
The essay mentions that China has launched satellites. What is the purpose of this action?
1. To provide free internet access to the entire world.
2. To test quantum communication over long distances.
3. To compete with traditional phone companies.
4. To take pictures of space for scientific research.
What is a current challenge facing the development of quantum communication?
1. It is difficult, expensive, and still in its early stages.
2. Scientists do not believe it will make the digital world safer.
3. The technology is already obsolete and being replaced.
4. It cannot be used to protect any important systems like banking.