Quantum Foundations Quiz

Q1 What is the fundamental unit of quantum information?

Byte Qubit Photon Electron

💡 A qubit (quantum bit) is the basic unit of quantum information, analogous to a classical bit but with quantum properties.

Q2 Which quantum phenomenon allows a qubit to exist in multiple states simultaneously?

Entanglement Superposition Decoherence Tunneling

💡 Superposition allows quantum systems to exist in multiple states until measured.

Q3 What happens to a qubit when it is measured?

It disappears It collapses to 0 or 1 It becomes entangled Nothing happens

💡 Measurement causes the quantum state to collapse to one of the basis states (0 or 1).

Q4 Which quantum gate is equivalent to a classical NOT gate?

Hadamard gate Pauli-X gate CNOT gate Phase gate

💡 The Pauli-X gate flips |0⟩ to |1⟩ and vice versa, just like a NOT gate.

Q5 What does the Hadamard gate do to a qubit in state |0⟩?

It stays in |0⟩ It becomes |1⟩ It creates equal superposition of |0⟩ and |1⟩ It becomes entangled

💡 The Hadamard gate creates an equal superposition of |0⟩ and |1⟩.

Q6 What is quantum entanglement?

Qubits that are physically connected Quantum correlation between particles regardless of distance A quantum error correction method The process of cooling quantum chips

💡 Entanglement is a quantum correlation where measuring one particle instantly affects its entangled partner.

Q7 Which algorithm demonstrates quantum advantage for searching?

Shors algorithm Grover algorithm Deutsch-Jozsa algorithm VQE algorithm

💡 Grover algorithm provides quadratic speedup for unstructured search problems.

Q8 What problem does Shors algorithm solve efficiently?

Searching databases Integer factorization Machine learning Weather prediction

💡 Shors algorithm can factor large numbers exponentially faster than classical algorithms.

Q9 What is quantum decoherence?

When qubits become entangled Loss of quantum properties due to environmental noise A type of quantum gate The process of reading qubits

💡 Decoherence is the loss of quantum properties due to environmental interference.

Q10 Which type of quantum computer uses photons as qubits?

Superconducting Trapped ion Photonic Topological

💡 Photonic quantum computers use photons (light particles) as qubits, operating at room temperature.