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.
Improved quantum error correction with randomized compiling.
Aditya Jain, Pavithran Iyer, Stephen D. Bartlett, and Joseph Emerson.
Phys. Rev. Research 5, 033049 – Published 25 July 2023.Non-Exponential Behaviour in Logical Randomized Benchmarking.
Athena Ceasura, Pavithran Iyer, Joel J. Wallman, and Hakop Pashayan.
arXiv:2212.05488, December 2022.Efficient diagnostics for quantum error correction.
Pavithran Iyer, Aditya Jain, Joseph Emerson, and Stephen Bartlett.
Phys. Rev. Research 4, 043218, August 2021.Bias-preserving gates with stabilized cat qubits.
Shruti Puri, Lucas St-Jean, Jonathan A Gross, Alexander Grimm, Nicholas E Frattini, Pavithran Iyer, Anirudh Krishna, Steven Touzard, Liang Jiang, Alexandre Blais, Steven T Flammia, SM Girvin.
Science Advances, Vol 6, Issue 3. August 2020.A small quantum computer is needed to optimize fault-tolerant protocols.
Pavithran Iyer and David Poulin.
Quantum Science and Technology, Volume 3, Number 3, June 2018.Fault-tolerant quantum computing in the Pauli or Clifford frame with slow error diagnostics.
Christopher Chamberland, Pavithran Iyer, and David Poulin.
Quantum 2, 43 (2018), January 2018.A linear-time benchmarking tool for generalized surface codes.
Nicolas Delfosse, Pavithran Iyer, and David Poulin.
arXiv:1611.04256, November 2016.Generalized surface codes and packing of logical qubits.
Nicolas Delfosse, Pavithran Iyer, and David Poulin.
arXiv:1606.07116, June 2016.Hardness of decoding quantum stabilizer codes.
Pavithran Iyer and David Poulin.
IEEE Transactions on Information Theory, 61(9):5209–5223, September 2015.sRNA Profiler: A User-Focused Interface for Small RNA Mapping and Profiling.
Charith Raj Adkar-Purushothama, Pavithran Iyer, Teruo Sano and Jean-Pierre Perreault.
Cells 2021, 10(7), June 2021.
Some unpublished notes on various topics in quantum information...
Software tools for research
SQUAB: A Fast Benchmarking Software for Surface Quantum Computing Architectures.
Nicolas Delfosse and Pavithran Iyer.chflow – Quantum error correction for realistic noise.
Pavithran Iyer, Aditya Jain and David Poulin.vbind: an sRNA Profiler
Pavithran Iyer and Charith Adkar.