Is there a quantum circuit to find the maximum of two inputs?
Quantum Computing Asked by Soulfulnerds on December 28, 2020
Is there a quantum circuit (preferably on Quirk as an example) that will enable me to find the maximum from two inputs?
Example
- input A: 11011
- input B: 11100
Expected output: 11100
One Answer
The easiest way is with a temporary comparison to decide which input to copy over:
If you want it to run without the extra output register, you can instead CSWAP the inputs based on the comparison bit, sorting them. You can't uncompute the comparison bit until you unsort them though.
Answered by Craig Gidney on December 28, 2020
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