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- W4387187848 abstract "Abstract A Hadamard-free Clifford transformation is a circuit composed of quantum Phase (P), CZ, and CNOT gates. It is known that such a circuit can be written as a three-stage computation, -P-CZ-CNOT-, where each stage consists only of gates of the specified type. In this paper, we focus on the minimization of circuit depth by entangling gates, corresponding to the important time-to-solution metric and the reduction of noise due to decoherence. We consider two popular connectivity maps: Linear Nearest Neighbor (LNN) and all-to-all. First, we show that a Hadamard-free Clifford operation can be implemented over LNN in depth 5 n , i.e., in the same depth as the -CNOT- stage alone. This allows us to implement arbitrary Clifford transformation over LNN in depth no more than 7 n − 4, improving the best previous upper bound of 9 n . Second, we report heuristic evidence that on average a random uniformly distributed Hadamard-free Clifford transformation over n > 6 qubits can be implemented with only a tiny additive overhead over all-to-all connected architecture compared to the best-known depth-optimized implementation of the -CNOT- stage alone. This suggests the reduction of the depth of Clifford circuits from $$2n,+,O({log }^{2}(n))$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>n</mml:mi> <mml:mspace /> <mml:mo>+</mml:mo> <mml:mspace /> <mml:mi>O</mml:mi> <mml:mrow> <mml:mo>(</mml:mo> <mml:mrow> <mml:msup> <mml:mrow> <mml:mi>log</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mrow> <mml:mi>n</mml:mi> </mml:mrow> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> to $$1.5n,+,O({log }^{2}(n))$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>1.5</mml:mn> <mml:mi>n</mml:mi> <mml:mspace /> <mml:mo>+</mml:mo> <mml:mspace /> <mml:mi>O</mml:mi> <mml:mrow> <mml:mo>(</mml:mo> <mml:mrow> <mml:msup> <mml:mrow> <mml:mi>log</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mrow> <mml:mi>n</mml:mi> </mml:mrow> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> over unrestricted architectures." @default.
- W4387187848 created "2023-09-30" @default.
- W4387187848 creator A5078401771 @default.
- W4387187848 creator A5082889085 @default.
- W4387187848 date "2023-09-29" @default.
- W4387187848 modified "2023-09-30" @default.
- W4387187848 title "CNOT circuits need little help to implement arbitrary Hadamard-free Clifford transformations they generate" @default.
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- W4387187848 doi "https://doi.org/10.1038/s41534-023-00760-2" @default.
- W4387187848 hasPublicationYear "2023" @default.
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