Quantum Computing and Its Impact on Cryptography

1. What is a qubit?

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

2. How does quantum superposition differ from classical superposition?

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

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

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

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

A) By using classical encryption algorithms with quantum networks.
B) By continuously changing encryption keys at a fast pace.
C) By relying on hardware-based encryption solutions.
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 runs on quantum networks.
D) Cryptography that only quantum computers can decrypt.

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

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

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

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

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