Jacob Blumoff
Los Angeles, CA

Applied physicist building quantum computers.

I lead multiqubit test and characterization at HRL Laboratories, working with silicon spin qubits. Before that I built superconducting qubits in the Schoelkopf lab at Yale.

Google Scholar Contact
Experience Selected publications

HRL Laboratories, LLC

2017—present · Malibu, CA
now2022

Multiqubit Test Methods Technical Lead 2022—present

  • Technical leadership of a multidisciplinary team focused on multiqubit QCVV & demonstrations
  • Responsible for technical input to the demonstration roadmap, managing execution, and keeping stakeholders apprised of progress and schedule (e.g. using Jira)
  • The test facet of the team is responsible for iterative requirements development, integration and validation of custom software, classical hardware, and quantum hardware, and collaboration with varied engineering teams
  • The analysis and modeling facet of the team focuses on model-hardware agreement and advanced QCVV, extracting error models, including space/time correlations, crosstalk effects, and emergent phenomena.

Group Lead VI–VII 2023—present

  • Personnel management of a test team with matrix-organization alignment to the Multiqubit Test Methods technical group (see above)
  • Responsibilities spanned recruiting, performance management, weekly one-on-ones
  • Regularly translated technical program needs and planning to corporate resources
  • Built a culture which prizes collaboration and documentation (e.g. in Confluence)
Nature · 2026 A digitally controlled silicon quantum processing unit A silicon quantum processor designed to scale: a custom 4 K cryo-CMOS controller, a dense superconducting interconnect, and an exchange-only qubit chip. Its 54 quantum dots host up to 18 qubits, with single- and two-qubit errors roughly an order of magnitude lower than previous exchange-only results. Repetition and error-detection codes on the device match simulation at the system level, previewing error correction on larger machines. arXiv · 2026 Benchmarking exchange-only control of a 48-spin singlet manifold PRX Quantum · 2024 Full-permutation dynamical decoupling in triple-quantum-dot spin qubits Nature · 2023 Universal logic with encoded spin qubits in silicon
20222017

Scientist IV–VI 2017—2022

  • Creation and execution of novel measurement protocols for semiconductor quantum device physics, developing physical understanding to drive qubit error modeling
  • Modeling and design for ultra-low-noise, high-integrity electromagnetic environments for measurement and control of cryogenic quantum devices
  • Regular technical reporting and presentation—in team, programmatic, and public settings—and mentorship of new team members
  • Substantial software development (principally Python), using Gitlab and CI/CD
PRX Quantum · 2022 Fast and high-fidelity state preparation and measurement in triple-quantum-dot spin qubits Error correction measures qubits every cycle, so readout has to be as fast and accurate as the gates. We initialize exchange-only Si/SiGe qubits in ~300 ns and read them out in under 1 µs, using only baseband electrical control, with a combined SPAM error of 2.5×10−3. Standard SPAM numbers can hide leakage out of the qubit space, so we introduced a leakage-sensitive metric that works for other qubit types too. We also break down the error budget to show what would push it lower. Phys. Rev. Applied · 2019 Spin-blockade spectroscopy of Si/SiGe quantum dots
Also Detuning axis pulsed spectroscopy of valley-orbital states in Si/SiGe quantum dots Phys. Rev. Applied · 2021

Yale University

PhD 2017 · MPhil 2014 · MS 2013
20172011

Graduate Researcher, Schoelkopf Lab 2011—2017

  • Design and fabrication of superconducting quantum devices
  • Operation of a dilution refrigerator and extensive work with microwave electronics
  • Programming for experimental control, simulation, and data acquisition and analysis
  • 10 semesters teaching experience

Advisor: Rob Schoelkopf

PhD dissertation · Yale · 2017 Multiqubit experiments in 3D circuit quantum electrodynamics Multiqubit experiments in 3D circuit QED, using transmons and qubits stored in microwave cavities. I showed how one high-Q resonator can measure several transmons jointly, the kind of parity measurement error correction is built on, and how to judge how good those measurements are. Combining that with an entangled transmon pair and real-time feedback, we performed the first deterministic teleported CNOT between two cavity-encoded qubits: a building block for modular machines linked by entanglement rather than direct wiring. Nature · 2018 Deterministic teleportation of a quantum gate between two logical qubits Phys. Rev. X · 2016 Implementing and characterizing precise multiqubit measurements Science · 2016 A Schrödinger cat living in two boxes Nature · 2014 Tracking photon jumps with repeated quantum non-demolition parity measurements
Also Coherent oscillations inside a quantum manifold stabilized by dissipation Phys. Rev. X · 2018 Micromachined integrated quantum circuit containing a superconducting qubit Phys. Rev. Applied · 2017 Quantum memory with millisecond coherence in circuit QED Phys. Rev. B · 2016 Characterizing entanglement of an artificial atom and a cavity cat state with Bell’s inequality Nat. Commun. · 2015

Georgia Institute of Technology

BS 2011 · Physics, highest honors
20112009

Undergraduate Researcher, Kuzmich Lab 2009—2011

  • Construction of a Rb MOT for coherent frequency conversion of optical photons
  • Construction of lasers, including temperature and current stabilization circuits
  • Design and assembly of ultra-high vacuum systems

Advisor: Alex Kuzmich

Phys. Rev. Lett. · 2010 Entanglement of light-shift compensated atomic spin waves with telecom light
Contact

jacobblumoff@gmail.com