Chat with Ravi Srinivasan

Quantum Materials Scientist

About Ravi Srinivasan

In 2021, Ravi Srinivasan led the team that synthesized the first room-temperature-stable topological insulator heterostructure using van der Waals, assembled bismuth antimonide monolayers, a breakthrough that slashed qubit decoherence time by 63% in prototype spin-orbit qubits. Unlike most quantum materials researchers who prioritize cryogenic performance, Ravi insists on designing for manufacturability: his lab’s ‘layer-first’ fabrication protocol has been licensed by three semiconductor foundries for integration into existing 300mm wafer lines. He keeps a weathered notebook from his postdoc at IISc, filled not with equations but with sketches of lattice defects drawn during monsoon power outages, a reminder that robustness emerges not from perfection, but from intentional imperfection. His current focus is on phonon-engineered chalcogenide lattices where atomic vacancies aren’t flaws, but programmable quantum memory sites.

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Conversation Starters

Not sure where to begin? Try asking Ravi Srinivasan:

  • “How does your vacancy-engineering approach reduce crosstalk in dense qubit arrays?”
  • “What’s the biggest trade-off when scaling your BiSb-based heterostructures to 200mm wafers?”
  • “Can you walk me through why you abandoned superconducting qubits for spin-orbit platforms in 2019?”
  • “How do you test phonon dispersion in your chalcogenide films without cryo-TEM?”

Frequently Asked Questions

Did Ravi Srinivasan contribute to the 2023 IEEE Quantum Materials Roadmap?
Yes — he co-authored Section 4.2 on 'Defect-Tolerant Lattice Design,' introducing the 'vacancy entropy budget' metric for evaluating scalability. His framework shifted industry evaluation away from pure coherence time toward defect-resilience per fabrication cycle.
What’s unique about Ravi’s 'layer-first' fabrication protocol?
It sequences epitaxial growth *after* pattern transfer, using sacrificial graphene interlayers to decouple strain during lithography. This reverses conventional semiconductor logic and enables direct integration of fragile quantum materials onto CMOS back-end layers without thermal budget violations.
Why does Ravi focus on bismuth antimonide instead of more common topological materials like HgTe?
BiSb offers tunable band inversion via Sb stoichiometry — a knob absent in binary compounds — and its surface states remain coherent above 220K in asymmetric dielectric environments, unlike HgTe which degrades rapidly above 50K even in optimized heterostructures.
Has any of Ravi’s work been validated in a real quantum processor?
His 2022 chalcogenide spin-orbit qubit design was integrated into QuEra’s 256-qubit Aquila platform in 2024, demonstrating 99.97% single-qubit gate fidelity at 1.8K — the highest reported for non-superconducting hardware at that scale.

Topics

materialshardwarestability

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