Pavithran Iyer Sridharan

Welcome to my webpage!

I'm working as a senior research scientist at Xanadu Quantum Technologies Inc, and I live in Toronto, Canada. My research interests span a broad spectrum, including quantum error correction, Fault-Tolerant quantum computing, quantum optics, and computational complexity problems in error correction.

Research track

I completed my graduate studies at Université de Sherbrooke, starting with a Master's in Physics in the group of (late) Prof. David Poulin. David was a pioneer in the field of quantum computing and information, and he was instrumental in cultivating my interest in the field. My Master's dissertation was on analyzing the computational complexity of the optimal decoding problem for Stabilizer codes -- a widely studied class of quantum error-correcting codes. We showed that decoding quantum codes is inherently harder than decoding classical codes due to degeneracy, a feature that is unique to quantum codes.

I learned the field working under David's supervision and continued to obtain my Ph.D. from Institut quantique at Université de Sherbrooke. My Ph.D. dissertation was a critical analysis of classical techniques used to benchmark and optimize fault-tolerant protocols. We studied fundamental problems in analyzing fault-tolerant protocols for realistic noise processes which theoretical models cannot accurately express. In particular, we addressed if standard error metrics are good candidate diagnostic tools for assessing the quantity of a logical qubit encoded in a quantum error correcting code. Besides we also analyzed numerical simulation methods for assessing the performance of decoding algorithms in quantum error correction. An everyday take on technical ideas can be found here. 

I completed a postdoc at the Institute for Quantum Computing in the group of Prof. Joseph Emerson. During my postdoc, I worked on research problems that address the role of randomized benchmarking in quantum error correction. Notably, we prescribed an efficient diagnostic tool for analyzing quantum error-correcting schemes, which can be computed from experimental noise characterization data from the hardware device. We also studied other problems at the interface of quantum error correction and noise characterization methods. For instance, the impact of randomized compiling on the performance of quantum error-correcting schemes and conceptual subtleties in logical randomized benchmarking.

During my postdoc at Waterloo, Canada, I also worked as a research scientist at Quantum Benchmark Inc , a startup founded by Prof. Joseph Emerson and Prof. Joel Wallman, focusing on developing protocols based on randomized benchmarking techniques to characterize errors in quantum hardware.

After my postdoc I started working at my current position, for Xanadu Quantum Technologies Inc startup based in Toronto, Canada. At present, I am a senior architecture scientist at Xanadu, where we focus on developing and optimizing fault tolerance schemes for quantum computing based on optical hardware. Contact me (see below) if you are interested in applying for a position in Xanadu with expertise in quantum error correction and fault tolerance.

Academic track

I did my schooling at Rishi Valley School , a boarding school situated in Andra Pradesh, India. I completed my Bachelor's in Physics from Chennai Mathematical Institute in 2008. During this time, I got introduced to quantum information and computation through summer internships and undergraduate projects. Especially during my extended internships under the supervision of Prof. Arvind at IISER-Mohali, and Prof. Subash Chaturvedi at the University of Hyderabad.

Click here to see a list of my publications and pre-prints.

Some unpublished notes on various topics in quantum information...

Software tools for research