PeopleofSuperintelligence

Researcher

Kostyantyn Kechedzhi

Kostyantyn Kechedzhi is a physicist at Google Quantum AI who works on what superconducting quantum processors can compute beyond classical machines. He began with graphene transport theory, publishing on weak localization in monolayer and bilayer graphene in 2009 with Vladimir Fal'ko and others, and wrote on quantum annealing with Vadim Smelyanskiy in 2016. His coauthored work includes the 2018 Science blueprint for quantum supremacy, the 2019 Nature paper on the Sycamore processor and a 2021 Nature paper on a discrete time crystal. In October 2025, he and Xiao Mi described the Quantum Echoes experiment on the Willow processor, which measures out-of-time-order correlators. He is a research scientist at Google Quantum AI.

Now at
Google

Timeline

  1. 2009

    Weak localization in graphene

    He coauthors "Weak localization in monolayer and bilayer graphene" in 2009 with Vladimir I. Fal'ko, B. L. Altshuler and colleagues, published in European Physical Journal Special Topics.

  2. 2013–2014

    Graphene plasmons and quantum Hall

    In 2013, he and S. Das Sarma publish "Plasmon anomaly in the dynamical optical conductivity of graphene". In 2014, he coauthors a paper with Sriram Ganeshan and Das Sarma on critical integer quantum Hall topology and the integrable Maryland model.

  3. 2016

    Open-system quantum annealing

    In 2016, he and Vadim N. Smelyanskiy publish "Open-System Quantum Annealing in Mean-Field Models with Exponential Degeneracy".

  4. 2018

    A quantum supremacy blueprint

    He is a coauthor of "A blueprint for demonstrating quantum supremacy with superconducting qubits" in Science in 2018, with Sergio Boixo, Hartmut Neven, J. M. Martinis and colleagues. In 2018, he also coauthors "Quantum algorithms to simulate many-body physics of correlated fermions" with Zhang Jiang, Kevin J. Sung, Vadim N. Smelyanskiy and Sergio Boixo.

  5. 2019

    Sycamore and quantum supremacy

    He is among the Google AI Quantum authors of the 2019 Nature paper "Quantum supremacy using a programmable superconducting processor". The Sycamore processor creates states on 53 qubits and samples a quantum circuit in about 200 seconds, a task estimated at 10,000 years for a classical supercomputer.

  6. 2021

    A discrete time crystal

    He coauthors "Time-crystalline eigenstate order on a quantum processor" in Nature in 2021, with a Google Research affiliation. The team uses controlled-phase gates on an array of superconducting qubits to observe a many-body-localized discrete time crystal.

  7. October 2025

    Quantum Echoes on Willow

    In October 2025, he and Xiao Mi, research scientists at Google Quantum AI, present Quantum Echoes, a Nature experiment on the Willow processor that measures out-of-time-order correlators and demonstrates a verifiable quantum advantage. Some of its 65-qubit data points are estimated to need 3.2 years each to simulate on the Frontier supercomputer.

Career

  1. NowGoogleResearch Scientist
  2. 2021Google Research

From the biography.

  1. Google had the most people shaping AI every year from 2014 to 2025Includes Google. Our estimates of which organizations employed the most people shaping AI each year from 1955 to 2025, tracing the shift from university labs to companies.
  2. Google has the highest combined h-index among AI organizationsIncludes Google. We estimate that Google holds the highest combined h-index at 8,016, while universities account for 73% of the deduplicated total across AI organizations.
  3. 20% of people at companies who shape AI also hold a university role, led by Google and Stanford UniversityIncludes Google. We estimate that 539 of the 6,766 people with a known current organization (8%) hold both a university role and a company role, including 20% of people at companies and 13% of people at universities.
  4. Google alumni have founded or led 133 other organizations, more than any other AI labIncludes Google. We estimate that alumni of 17 major AI labs went on to found or lead 350 other organizations, including 226 they founded, and we trace 472 career moves directly between 23 labs since 2010.

Colleagues

People named in this biography, and people with dated positions at the same organization in the same years.

Sources and credits

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  1. QuAIL publications | NASA nasa.gov. Checked 21 October 2026.
  2. Quantum supremacy using a programmable superconducting processor | Nature nature.com. Checked 21 October 2026.
  3. Time-crystalline eigenstate order on a quantum processor | Nature nature.com. Checked 21 October 2026.
  4. Observation of constructive interference at the edge of quantum ergodicity | Nature nature.com. Checked 21 October 2026.
  5. A verifiable quantum advantage research.google. Checked 21 October 2026.