Mitigating depolarizing noise on quantum computers with noise-estimation circuits
Urbanek, Miroslav, Nachman, Benjamin, Pascuzzi, Vincent R, He, Andre, Bauer, Christian W, Jong, Wibe A de
Abstract
A significant problem for current quantum computers is noise. While there are\nmany distinct noise channels, the depolarizing noise model often appropriately\ndescribes average noise for large circuits involving many qubits and gates. We\npresent a method to mitigate the depolarizing noise by first estimating its\nrate with a noise-estimation circuit and then correcting the output of the\ntarget circuit using the estimated rate. The method is experimentally validated\non the simulation of the Heisenberg model. We find that our approach in\ncombination with readout-error correction, randomized compiling, and zero-noise\nextrapolation produces results close to exact results even for circuits\ncontaining hundreds of CNOT gates.