Publications

Integrated photonics

A broadband, individually addressing two- and three-dimensional photonic integrated circuit for trapped-ion qubit control

D. Klawson, Y. Zhi, B. You, M. Bareian, E. Mossman, et al.

arXiv:2607.25062

Nuclear clock

Defect assignment of the clock site in ²²⁹Th:CaF₂

D. A. Rhen, H. W. T. Morgan, H. E. Mason, H. B. Tran Tan, R. Elwell, et al.

arXiv:2607.12202

Nuclear clock

Ab initio calculations of ²²⁹Th band-to-band internal conversion rate in ²²⁹ThO₂

U. C. Perera, H. B. Tran Tan, H. W. T. Morgan, E. R. Hudson, D. A. Rhen, and A. Derevianko

arXiv:2607.08941

Review

Colloquium: Nuclear Clocks

A. Derevianko, R. T. Elwell, and E. R. Hudson

arXiv:2606.11048

Quantum sensing

Nonlinear-Enhanced Wideband Sensing via Subharmonic Excitation of a Quantum Harmonic Oscillator

H. Wu, C. Z. C. Ho, G. D. Mitts, J. A. Rabinowitz, and E. R. Hudson

Physical Review Letters 136, 170801

Complex molecules

Bottom-up approach to making larger hydrocarbon molecules capable of optical cycling

G. Lao, T. Khvorost, A. Macias Jr., H. W. T. Morgan, et al.

Nature Chemistry 18, 84

Nuclear clock

Laser-based conversion electron Mössbauer spectroscopy of ²²⁹ThO₂

R. Elwell, J. E. S. Terhune, C. Schneider, H. W. T. Morgan, et al.

Nature 648, 300

Complex molecules

Vibronic coupling limits the use of high-lying electronic states in complex molecules for laser cooling

H. Zhou, P. Wojcik, G.-Z. Zhu, G. Lao, T. Khvorost, et al.

Physical Review Research 7, 043180

Nuclear clock

Host-dependent frequency offsets in ²²⁹Th nuclear clockwork

U. C. Perera, H. W. T. Morgan, E. R. Hudson, and A. Derevianko

Physical Review Letters 135, 123001

Nuclear clock

Theory of Internal Conversion of the ²²⁹Th Nuclear Isomer in Solid-State Hosts

H. W. T. Morgan, H. B. Tran Tan, R. Elwell, A. N. Alexandrova, E. R. Hudson, and A. Derevianko

Physical Review Letters 134, 253801

Nuclear clock

Photoinduced quenching of the ²²⁹Th isomer in a solid-state host

J. Terhune, R. Elwell, H. B. Tran Tan, U. C. Perera, et al.

Physical Review Research 7, L022062

Nuclear clock

Design of new thorium nuclear clock materials based on polyatomic ions

Quantum sensing

Super-resolution of two closely-spaced electromagnetic fields via Walsh-modulated dynamical decoupling spectroscopy

Quantum sensing

Floquet-engineered decoherence-resilient protocols for wideband sensing beyond the linear standard quantum limit

Nuclear clock

Proposal and theoretical investigation of ²²⁹Th-doped nonlinear optical crystals for compact solid-state clocks

Quantum sensing

Wideband electric field quantum sensing via motional Raman transitions

Nuclear clock

Radiative decay of the ²²⁹ᵐTh nuclear clock isomer in different host materials

Quantum information

Absorption-Emission Codes for Atomic and Molecular Quantum Information Platforms

Nuclear clock

²²⁹ThF₄ thin films for solid-state nuclear clocks

Complex molecules

Photoswitching Molecules Functionalized with Optical Cycling Centers Provide a Novel Platform for Studying Chemical Transformations in Ultracold Molecules

Nuclear clock

Laser excitation of the ²²⁹Th nuclear isomeric transition in a solid-state host

Quantum information

Eliminating qubit-type cross-talk in the omg protocol

Complex molecules

Dual Optical Cycling Centers Mounted on an Organic Scaffold: New Insights from Quantum Chemistry Calculations and Symmetry Analysis

Complex molecules

Extending the large molecule limit: The role of Fermi resonance in developing a quantum functional group

Quantum information

Raman Scattering Errors in Stimulated-Raman-Induced Logic Gates in ¹³³Ba⁺

Instrumentation

Low-drift-rate external cavity diode laser

Quantum information

Photon scattering errors during stimulated Raman transitions in trapped-ion qubits

Complex molecules

Laser spectroscopy of aromatic molecules with optical cycling centers: strontium (I) phenoxides

Complex molecules

On the prospects of optical cycling in diatomic cations: effects of transition metals, spin–orbit couplings, and multiple bonds

Complex molecules

Functionalizing Aromatic Compounds with Optical Cycling Centers

Complex molecules

Pathway Towards Optical Cycling and Laser Cooling of Functionalized Arenes

Molecular spectroscopy

High-resolution laser-induced fluorescence spectroscopy of ²⁸Si¹⁶O⁺ and ²⁹Si¹⁶O⁺ in a cryogenic buffer-gas cell

Quantum information

omg blueprint for trapped ion quantum computing with metastable states

Instrumentation

Increase of the barium ion-trap lifetime via photodissociation

Cold chemistry

Determining the reaction pathway at low temperatures by isotopic substitution: the case of BeD⁺ + H₂O

Quantum information

Laserless quantum gates for electric dipoles in thermal motion

Complex molecules

Optical Cycling Functionalization of Arenes

Cold chemistry

Isomer-specific kinetics of the C⁺ + H₂O reaction at the temperature of interstellar clouds

Fundamental physics

HUNTER: precision massive-neutrino search based on a laser-cooled atomic source

Molecular quantum logic

Dipole-phonon quantum logic with alkaline-earth monoxide and monosulfide cations

Instrumentation

Application of a self-injection locked cyan laser for barium ion cooling and spectroscopy

Molecular quantum logic

Dipole-Phonon Quantum Logic with Trapped Polar Molecular Ions

Complex molecules

In search of molecular ions for optical cycling: a difficult road

Quantum information

High-fidelity manipulation of a qubit enabled by a manufactured nucleus

Cold chemistry

Isotope-selective chemistry in the Be⁺ (²S₁/₂) + HOD → BeOD⁺/BeOH⁺ + H/D reaction

Cold chemistry

Engineering Excited-State Interactions at Ultracold Temperatures

Cold chemistry

Excitation-assisted nonadiabatic charge-transfer reaction in a mixed atom-ion system

Nuclear clock

The concept of laser-based conversion electron Mössbauer spectroscopy for a precise energy determination of ²²⁹ᵐTh

Cold chemistry

Reaction blockading in a reaction between an excited atom and a charged molecule at low collision energy

Molecular quantum logic

Dipolar Quantum Logic for Freely Rotating Trapped Molecular Ions

Instrumentation

High-resolution collision energy control through ion position modulation in atom-ion hybrid systems

Cold chemistry

Optical Control of Reactions between Water and Laser-Cooled Be⁺ Ions

Cold chemistry

Synthesis of mixed hypermetallic oxide BaOCa⁺ from laser-cooled reagents in an atom-ion hybrid trap

Quantum information

Spectroscopy of a Synthetic Trapped Ion Qubit

Instrumentation

Efficient repumping of a Ca magneto-optical trap

Review

Sympathetic cooling of molecular ions with ultracold atoms

Cold chemistry

Blue-sky bifurcation of ion energies and the limits of neutral-gas sympathetic cooling of trapped ions

Cold chemistry

Explanation of efficient quenching of molecular ion vibrational motion by ultracold atoms

Instrumentation

Electronics of an ion trap with integrated time-of-flight mass spectrometer

Nuclear clock

Radiative lifetime and energy of the low-energy isomeric level in ²²⁹Th

Molecular spectroscopy

Photodissociation spectroscopy of the dysprosium monochloride molecular ion

Nuclear clock

Results of a Direct Search Using Synchrotron Radiation for the Low-Energy ²²⁹Th Nuclear Isomeric Transition

Instrumentation

Laser-Cooling-Assisted Mass Spectrometry

Molecular spectroscopy

Action spectroscopy of SrCl⁺ using an integrated ion trap time-of-flight mass spectrometer

Cold chemistry

Neutral Gas Sympathetic Cooling of an Ion in a Paul Trap

Trapped ions

Measurement of the Coulomb Logarithm in a Radio-Frequency Paul Trap

Cold chemistry

Evidence for sympathetic vibrational cooling of translationally cold molecules

Cold chemistry

Role of Electronic Excitations in Ground-State-Forbidden Inelastic Collisions Between Ultracold Atoms and Ions

Instrumentation

Low-threshold ultraviolet solid-state laser based on a Ce³⁺:LiCaAlF₆ crystal resonator

Instrumentation

An integrated ion trap and time-of-flight mass spectrometer for chemical and photo-reaction dynamics studies

Nuclear clock

Optical spectroscopy of an atomic nucleus: Progress toward direct observation of the ²²⁹Th isomer transition

Cold chemistry

Measurement of a Large Chemical Reaction Rate between Ultracold Closed-Shell ⁴⁰Ca Atoms and Open-Shell ¹⁷⁴Yb⁺ Ions Held in a Hybrid Atom-Ion Trap

Molecular ions

Trapping molecular ions formed via photo-associative ionization of ultracold atoms

Molecular spectroscopy

Molecular-ion trap-depletion spectroscopy of BaCl⁺

Nuclear clock

Progress towards fabrication of ²²⁹Th-doped high energy band-gap crystals for use as a solid-state optical frequency reference

Nuclear clock

Constraining the Evolution of the Fundamental Constants with a Solid-State Optical Frequency Reference Based on the ²²⁹Th Nucleus

Molecular ions

Method for producing ultracold molecular ions

Molecular physics

Deceleration of continuous molecular beams

Nuclear clock

Computer modelling of thorium doping in LiCaAlF₆ and LiSrAlF₆: application to the development of solid state optical frequency devices