Experimental Validation of the Influence of Control Noise on Fidelity

Noise in control pulses is a ubiquitous problem in NISQ-era quantum computers. Here we experimentally study the relationship between control noise and qubit state fidelity and compare this to recent theoretical predictions [1]. We use our Ruby platform which contains a 10 x 10 tweezer array that is stochastically loaded from a Rb-85 MOT. We apply control signals in the form of a global microwave field featuring artificial noise and determine the resulting fidelity of the qubit operation. The resulting fidelity distributions are compared to theoretical predictions resulting from a stochastic Schrödinger equation treatment. In both cases we find characteristic behavior of fidelity versus noise duration for different types of noise, which are generally in good agreement. Simulation of gate operations using the stochastic Schrödinger equation therefore allows for a detailed treatment of the influence of control noise beyond average characteristics.