# Quantum adder mod 4 [closed]

Does anyone has (or is aware of) a solution to Nielsen's QCQI 4.36 exercise: construct a circuit to add two-qubit numbers x and y modulo 4 vs $$|x,y\rangle \rightarrow |x, x+y \mod 4\rangle$$

• Welcome to Quantum Computing SE! Would you be able to edit the question to include details of what you've tried and where exactly you're having problems? Dec 21 '19 at 11:02
• Dec 21 '19 at 18:20
• Thank you for your comments. Two notes here: 1. I consider the question is clearly formulated ! AND 2. Yes, it's a duplicate of the mentioned post (sorry for this omission) Dec 22 '19 at 6:54