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Importance of Diagonal Gates in Tensor Network Simulations

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arxiv 2106.15740 v1 pith:OJVKMQQW submitted 2021-06-29 quant-ph cs.DS

Importance of Diagonal Gates in Tensor Network Simulations

classification quant-ph cs.DS
keywords qaoasimulationstechniquescircuitscircuitdepthincreaseincreased
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this work we present two techniques that tremendously increase the performance of tensor-network based quantum circuit simulations. The techniques are implemented in the QTensor package and benchmarked using Quantum Approximate Optimization Algorithm (QAOA) circuits. The techniques allowed us to increase the depth and size of QAOA circuits that can be simulated. In particular, we increased the QAOA depth from 2 to 5 and the size of a QAOA circuit from 180 to 244 qubits. Moreover, we increased the speed of simulations by up to 10 million times. Our work provides important insights into how various techniques can dramatically speed up the simulations of circuits.

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