Quantum Computing and Its Impact on Cryptography

1. What is a qubit?

A) A classical bit used in regular computing.
B) A type of encryption algorithm.
C) A software language for quantum programming.
D) A basic unit of quantum information.

2. How does quantum superposition differ from classical superposition?

A) Classical superposition involves physical waves.
B) Quantum superposition allows qubits to be in multiple states simultaneously.
C) Classical superposition is more stable.
D) Quantum superposition only applies to photon states.

3. Which classical public-key encryption algorithm is vulnerable to quantum attacks?

A) Diffie-Hellman
B) SHA-256
C) AES
D) RSA

4. Which quantum algorithm is used for searching unsorted databases faster than classical algorithms?

A) Grover's algorithm
B) Shor's algorithm
C) Bernstein-Vazirani algorithm
D) Deutsch's algorithm

5. What is post-quantum cryptography?

A) Cryptography designed to be secure against quantum attacks.
B) Cryptography that only quantum computers can decrypt.
C) Cryptography used after a successful quantum encryption.
D) Cryptography that runs on quantum networks.

6. What is the term for a quantum computer's ability to perform many calculations simultaneously?

A) Quantum entanglement
B) Quantum interference
C) Quantum parallelism
D) Quantum superposition

7. What is the theoretical advantage of quantum computers over classical ones in terms of solving certain problems?

A) Better at solving purely mathematical problems.
B) Faster at processing large datasets.
C) Exponential speedup for some algorithms.
D) Linear speedup for all algorithms.

8. How does quantum key distribution (QKD) ensure secure communication?

A) By continuously changing encryption keys at a fast pace.
B) By relying on hardware-based encryption solutions.
C) By using classical encryption algorithms with quantum networks.
D) By leveraging the principles of quantum mechanics for key exchange.

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