Quantum Computing and Its Impact on Cryptography

1. What is a qubit?

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

2. How does quantum superposition differ from classical superposition?

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

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

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

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

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

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

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

6. What is post-quantum cryptography?

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

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

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

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

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

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