News

Co-authors Balint Pato and Theerapat Tansuwannont enjoying a meal.

Concatenated Steane Code with Flags

Which distance 9 color code is the best?

Co-authors Evan Reed and Lu Qi

Optimizing Sideband Cooling

There are many ways to sideband cool ions. How do they compare?

Single-shot decoding of the surface code

Single-shot decoding of the surface code

Quantum error correction is a possible solution to reduce the loss of quantum information in the system. By measuring check operators, we can infer and correct the errors in the system without destroying the encoded quantum states. However, since all...

conical results

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Conical Intersections

Brown Lab Graduates

Brown Lab Graduates

Brown and MIST Lab 2023 MS, MEng, and PhD Graduates

Quantum error correction with metastable states of trapped ions using erasure conversion

Quantum error correction with metastable states of trapped ions using erasure conversion

Quantum error correction (QEC) is necessary for achieving a scalable and fault-tolerant quantum computer, as physical operations on quantum states are prone to errors. QEC can be challenging as entangled states of many physical qubits are used to encode...

Best Paper Award at IEEE Quantum Week

Best Paper Award at IEEE Quantum Week

Leon Riesebos and Kenneth Brown win Best Paper Award: Track: Quantum Systems Software for  "Functional simulation of real-time quantum control software"

Determination of Multimode Motional Quantum States in a Trapped Ion System

Determination of Multimode Motional Quantum States in a Trapped Ion System

Complex bosonic states play an important role in quantum simulations, quantum computation and spin-boson interactions. While direct readout of multi-mode bosonic states can be challenging, the Jaynes-Cummings type interactions can coherently map the...

Catherine Liang defends her Honors Thesis

Catherine Liang defends her Honors Thesis

Congratulations to Catherine (Qiyao) Liang on defending her undergraduate Honors Thesis in Physics and receiving Highest Honors!

| Duke Engineering

Bacon-Shor Demonstration

Batch Optimization of Frequency-Modulated Pulses for Robust Two-Qubit Gates in Ion Chains

Batch Optimization of Frequency-Modulated Pulses for Robust Two-Qubit Gates in Ion Chains

Uncertainty in control parameters limits the quality of operations and algorithms on a quantum computer. Typical methods for building operations that are robust to these errors still optimize for the ideal case. In our recent publication (Kang, M. et al...

Hidden inverses: Coherent error cancellation at the circuit level

Hidden inverses: Coherent error cancellation at the circuit level

In our new preprint (arXiv: 2104.01119) in collaboration with the MIST lab, we demonstrate a new technique “hidden inverses”, which suppresses slow varying coherent errors in quantum computing circuits efficiently. The “hidden inverses” method reduces...

Swarnadeep awarded QISE-NET fellowship with ORNL

Brown lab member, Swarnadeep Majumder, was awarded a Quantum Information Science and Engineering Network (QISE-NET) fellowship. Swarnadeep will be a part of the third cohort of the QISE-NET program, an NSF funded national training program for graduate...

Extended flag gadgets for low-overhead circuit verification

Extended flag gadgets for low-overhead circuit verification

A new work has been posted on the arXiv entitled 'Extended Flag Gadgets for Low-Overhead Circuit Verification.' In this work we propose an extension to the flag qubit framework which can be applied in a more general setting. Our gadgets can detect faults...

Manipulating molecular ion qubits

Manipulating molecular ion qubits

Our new preprint on coupling molecular and atomic ion qubits can be found at arXiv:2008.09201 .This work is in collaboration with the Eric Hudson and Wes Campbell groups at UCLA and Michael Heaven at Emory University.