Hard Quantum Computing Quiz: Gates, Entanglement, and Error Correction
A rigorous nine-question test probing deep concepts in quantum computing, from circuit design to fault-tolerant strategies.
Quiz Questions
Answer all questions below and test your knowledge.
- 1
Which single-qubit gate, together with the CNOT gate, forms a universal set for quantum computation?
- 2
In the [[7,1,3]] Steane code, what does the distance parameter 3 indicate?
- 3
The quantum Fourier transform on n qubits can be implemented using O(n^2) basic gates. What is the leading term of this gate count?
- 4
How many Grover iterations are needed to find a marked item with high probability in a database of size N, assuming a single solution?
- 5
What is the von Neumann entropy of either subsystem of a maximally entangled Bell pair?
- 6
If the coherence time T2 of a qubit is 50 µs and each gate takes 25 ns, approximately how many sequential gates can be applied before decoherence dominates?
- 7
Which classical subroutine is essential for the period-finding step in Shor's algorithm?
- 8
Which anyon model underlies the most widely studied topological qubit platform?
- 9
In measurement-based quantum computing, which highly entangled state serves as the universal resource?
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