In the News
September 10, 2023
Conical Intersections
May 13, 2023
Brown Lab Graduates
Brown and MIST Lab 2023 MS, MEng, and PhD Graduates. Front row: Yuhi Akiyo, PhD; Zhubing Gloria Jia, PhD; Ruchi Pendse, MS; Robert Tripp Spivey, PhD; Swarnadeep Majumder, PhD. Back Row: Shilin Huang, PhD; Leon Riesebos, PhD; Grant Eberle, MEng; Chao Fang, Phd.
January 16, 2023
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 quantum information. The performance of QEC [...]
September 21, 2022
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". Pictured here is Leon receiving the award from Professor Greg Byrd the General Chair of QCE 2022. Read more about our control system Duke Artiq [...]
May 24, 2022
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 information of bosonic states onto spin states [...]
April 16, 2022
Catherine Liang defends her Honors Thesis
Congratulations to Catherine (Qiyao) Liang on defending her undergraduate Honors Thesis in Physics and receiving Highest Honors! Catherine co-founded the Duke Undergraduate Quantum Information Society (duqis.org) and has co-authored two papers on two-qubit trapped ion gates. High-fidelity Two- [...]
October 3, 2021
Bacon-Shor Demonstration
September 15, 2021
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., Phys. Rev. Applied 16, 024039, [...]
April 2, 2021
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 control errors by constructing quantum gates [...]
November 3, 2020
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 students pursuing careers in quantum science [...]
September 17, 2020
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 on generic unitaries, and are low overhead [...]
August 20, 2020
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. In this article we discuss a novel laser-free method of using an atomic ion for [...]
April 10, 2020
Architecting noisy intermediate-scale trapped ion quantum computers
New paper published in the International Symposium on Computer Architecture (ISCA2020)!
March 13, 2020
Critical faults of leakage errors on the surface code
Leakage is a particularly damaging error that occurs when a qubit leaves the defined computational subspace.
March 12, 2020
Photon-mediated charge-exchange reactions between 39K atoms and 40Ca+ ions in a hybrid trap
Our detailed study of photon-mediated charge exchange between cold Potassium atoms and calcium ions is published in the journal Physical Chemistry Chemical Physics.