Classiq Quantum Circuit Challenge
Implement a quantum phase oracle that encodes the Classiq logo, then optimize it for minimum circuit depth. Submissions are ranked automatically, with CX count breaking ties.
726
Best depth
Charlie · CX 4213
5329
Baseline depth
Classiq 1.26 reference
10
Valid submissions
726
Registered participants
The problem
The target is a 64×64 binary image of the Classiq logo with 1,097 marked pixels. Two 6-qubit registers encode the coordinates x and y. Build a phase oracle that flips the phase of every computational basis state whose (x, y) lands on a marked pixel, and leaves every other state unchanged.
Up to 6 clean ancillas are available (18 qubits total). The oracle is transpiled to u3 and cx gates under all-to-all connectivity. Submissions are ranked by circuit depth, then CX count. A working (unoptimized) baseline is provided; your goal is to improve it.
Scoring metrics
Circuit depth after transpilation to u3/cx. Primary ranking key, lower is better.
Number of two-qubit CX gates. Tie-breaker when depths are equal.
Qubits used: 12 coordinate + up to 6 ancillas. Informational, capped at 18.
How to enter
Create an account and get free access to the Classiq platform.
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Start from the baseline notebook, then optimize your synthesis for depth.
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Upload your .qmod and .qasm for automatic grading. As others improve, you'll get passed — so resubmit (up to once per hour) and keep optimizing until the challenge closes.
Prizes
$10,000
total pool · five winners · $2,000 each
The top five participants on the final leaderboard each receive $2,000.
Schedule
opens
August 28, 2026
closes
September 30, 2026
The leaderboard is live for the whole month. Submit early, then keep improving — only the standings at close decide the top five.