Linear-depth quantum circuits for multiqubit controlled gates

• URL: http://arxiv.org/abs/2203.11882v2
• Date: Tue, 4 Oct 2022 22:40:05 GMT
• Title: Linear-depth quantum circuits for multiqubit controlled gates
• Authors: Adenilton J. da Silva and Daniel K. Park
• Abstract summary: We present a systematic procedure to decompose multiqubit controlled unitary gates. We show the advantage of our algorithm with proof-of-principle experiments on the IBM quantum cloud platform.
• Score: 3.0001636668817606
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum circuit depth minimization is critical for practical applications of circuit-based quantum computation. In this work, we present a systematic procedure to decompose multiqubit controlled unitary gates, which is essential in many quantum algorithms, to controlled-NOT and single-qubit gates with which the quantum circuit depth only increases linearly with the number of control qubits. Our algorithm does not require any ancillary qubits and achieves a quadratic reduction of the circuit depth against known methods. We show the advantage of our algorithm with proof-of-principle experiments on the IBM quantum cloud platform.

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