# circuits
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Quantum just published a viewpoint of mine on great work of Banchi and Crooks on a stochastic parameter-shift rule.
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The parameter-shift rule is a workhorse for the optimization of parametrized quantum circuits. In this post, I explain how it also works in a noisy context and how we can extend it to convex combinations of quantum channels. This blog post is a summary of Appendix A of our paper A variational toolbox for quantum multi-parameter estimation 1.
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I’m proud to share my first paper as a first-author: In A variational toolbox for quantum multi-parameter estimation, me and my co-authors Johannes Borregaard and Jens Eisert provide a variational quantum algorithm to optimize sensing protocols for quantum multi-parameter estimation.