Eric R. Hudson
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View article: Barium Autoionization for Efficient Ion Trap Loading
Barium Autoionization for Efficient Ion Trap Loading Open
We report a theoretical and experimental investigation of autoionizing resonances from the $5d6p\,{}^3\mathrm{D}_1^o$ manifold in neutral barium for efficient loading of ion traps. Our calculations predict large resonant cross sections for…
View article: Laser-based conversion electron Mössbauer spectroscopy of 229ThO2
Laser-based conversion electron Mössbauer spectroscopy of 229ThO2 Open
The exceptionally low-energy 229 Th nuclear isomeric state is expected to provide several new and powerful applications 1,2 , including the construction of a robust and portable solid-state nuclear clock 3 , perhaps contributing to a redef…
View article: A cryogenic Paul trap for probing the nuclear isomeric excited state $$^{229\text {m}}$$Th$$^{3+}$$
A cryogenic Paul trap for probing the nuclear isomeric excited state $$^{229\text {m}}$$Th$$^{3+}$$ Open
View article: A cryogenic Paul trap for probing the nuclear isomeric excited state $^{229\text{m}}$Th$^{3+}$
A cryogenic Paul trap for probing the nuclear isomeric excited state $^{229\text{m}}$Th$^{3+}$ Open
While laser excitation of the nuclear isomeric transition in $^{229}$Th has been recently achieved for thorium atoms embedded in large-bandgap crystals, laser excitation and characterization of the nuclear transition in trapped $^{229}$Th$…
View article: Super-resolution of two Closely-spaced Electromagnetic Fields via Walsh-Modulated Dynamical Decoupling Spectroscopy
Super-resolution of two Closely-spaced Electromagnetic Fields via Walsh-Modulated Dynamical Decoupling Spectroscopy Open
Due to quantum fluctuations, non-orthogonal quantum states cannot be distinguished with complete certainty, making their underlying physical parameters difficult to resolve. Traditionally, it has been believed that the linewidth of a syste…
View article: Theory of Internal Conversion of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Th</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>229</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> Nuclear Isomer in Solid-State Hosts
Theory of Internal Conversion of the Nuclear Isomer in Solid-State Hosts Open
Laser excitation of ^{229}Th nuclei in doped wide band gap crystals has been demonstrated recently, opening the possibility of developing ultrastable solid-state clocks and sensitive searches for new physics. We develop a quantitative theo…
View article: $^{229}$Th Nuclear Spectroscopy in an Opaque Material: Laser-Based Conversion Electron Mössbauer Spectroscopy of $^{229}$ThO$_2$
$^{229}$Th Nuclear Spectroscopy in an Opaque Material: Laser-Based Conversion Electron Mössbauer Spectroscopy of $^{229}$ThO$_2$ Open
Here, we report the first demonstration of laser-induced conversion electron Mössbauer spectroscopy of the $^{229}$Th nuclear isomeric state, which provides the ability to probe the nuclear transition in a material that is opaque to light …
View article: Floquet-engineered decoherence-resilient protocols for wideband sensing beyond the linear standard quantum limit
Floquet-engineered decoherence-resilient protocols for wideband sensing beyond the linear standard quantum limit Open
A key advantage of quantum metrology is the ability to surpass the standard quantum limit for measurement precision through the use of non-classical states. However, there is typically little to no improvement in precision with the use of …
View article: Photoinduced quenching of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Th</mml:mi><mml:mprescripts/><mml:none/><mml:mn>229</mml:mn></mml:mmultiscripts></mml:math> isomer in a solid-state host
Photoinduced quenching of the isomer in a solid-state host Open
The population dynamics of the Th
View article: Host-dependent frequency offsets in $^{229}$Th nuclear clockwork
Host-dependent frequency offsets in $^{229}$Th nuclear clockwork Open
Recent advances in laser excitation of the low-energy nuclear isomer transition in $^{229}$Th have opened avenues for developing nuclear clocks, a novel quantum technology with exceptional performance and sensitivity to exotic physics. Her…
View article: Proposal and theoretical investigation of 229Th-doped nonlinear optical crystals for compact solid-state clocks
Proposal and theoretical investigation of 229Th-doped nonlinear optical crystals for compact solid-state clocks Open
The recent laser excitation of the 229Th isomeric transition in a solid-state host opens the door for a portable solid-state nuclear optical clock. However, at present, the vacuum-ultraviolet laser systems required for clock operation are …
View article: Radiative decay of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Th</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>229</mml:mn><mml:mi>m</mml:mi></mml:mrow></mml:mmultiscripts></mml:math> nuclear clock isomer in different host materials
Radiative decay of the nuclear clock isomer in different host materials Open
A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay of the Th
View article: Design of new thorium nuclear clock materials based on polyatomic ions
Design of new thorium nuclear clock materials based on polyatomic ions Open
Compounds of polyatomic anions are investigated theoretically as hosts for thorium in nuclear clock devices.
View article: Photoswitching Molecules Functionalized with Optical Cycling Centers Provide a Novel Platform for Studying Chemical Transformations in Ultracold Molecules
Photoswitching Molecules Functionalized with Optical Cycling Centers Provide a Novel Platform for Studying Chemical Transformations in Ultracold Molecules Open
A novel molecular structure that bridges the fields of molecular optical cycling and molecular photoswitching is presented. It is based on a photoswitching molecule azobenzene functionalized with one and two CaO- groups, which can act as o…
View article: 229ThF4 thin films for solid-state nuclear clocks
229ThF4 thin films for solid-state nuclear clocks Open
After nearly 50 years of searching, the vacuum ultraviolet 229Th nuclear isomeric transition has recently been directly laser excited1,2 and measured with high spectroscopic precision3. Nuclear clocks based…
View article: Photo-Induced Quenching of the 229Th Isomer in a Solid-State Host
Photo-Induced Quenching of the 229Th Isomer in a Solid-State Host Open
The population dynamics of the 229Th isomeric state is studied in a solid-state host under laser illumination. A photoquenching process is observed, where off-resonant vacuum-ultraviolet (VUV) radiation leads to relaxation of the isomeric …
View article: Theory of internal conversion of the thorium-229 nuclear isomer in solid-state hosts
Theory of internal conversion of the thorium-229 nuclear isomer in solid-state hosts Open
Laser excitation of thorium-229 nuclei in doped wide bandgap crystals has been demonstrated recently, opening the possibility of developing ultrastable solid-state clocks and sensitive searches for new physics. We develop a quantitative th…
View article: Bottom-up approach to scalable growth of molecules capable of optical cycling
Bottom-up approach to scalable growth of molecules capable of optical cycling Open
Gas-phase molecules capable of repeatable, narrow-band spontaneous photon scattering are prized for direct laser cooling and quantum state detection. Recently, large molecules incorporating phenyl rings have been shown to exhibit similar v…
View article: 229Th-doped nonlinear optical crystals for compact solid-state clocks
229Th-doped nonlinear optical crystals for compact solid-state clocks Open
The recent laser excitation of the 229Th isomeric transition in a solid-state host opens the door for a portable solid-state nuclear optical clock. However, at present the vacuum-ultraviolet laser systems required for clock operation are n…
View article: $^{229}\mathrm{ThF}_4$ thin films for solid-state nuclear clocks
$^{229}\mathrm{ThF}_4$ thin films for solid-state nuclear clocks Open
After nearly fifty years of searching, the vacuum ultraviolet $^{229}$Th nuclear isomeric transition has recently been directly laser excited [1,2] and measured with high spectroscopic precision [3]. Nuclear clocks based on this transition…
View article: Photoswitching molecules functionalized with optical cycling centers provide a novel platform for studying chemical transformations in ultracold molecules
Photoswitching molecules functionalized with optical cycling centers provide a novel platform for studying chemical transformations in ultracold molecules Open
A novel molecular structure that merges the fields of molecular optical cycling with molecular photoswitching is presented. It is based on a photoswitching molecule azobenzene functionalized with one and two CaO- groups, which can act as o…
View article: Laser Excitation of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Th</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>229</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> Nuclear Isomeric Transition in a Solid-State Host
Laser Excitation of the Nuclear Isomeric Transition in a Solid-State Host Open
LiSrAlF_{6} crystals doped with ^{229}Th are used in a laser-based search for the nuclear isomeric transition. Two spectroscopic features near the nuclear transition energy are observed. The first is a broad excitation feature that produce…
View article: Dual Optical Cycling Centers Mounted on an Organic Scaffold: New Insights from Quantum Chemistry Calculations and Symmetry Analysis
Dual Optical Cycling Centers Mounted on an Organic Scaffold: New Insights from Quantum Chemistry Calculations and Symmetry Analysis Open
Molecules cooled to ultracold temperatures are desirable for applications in fundamental physics and quantum information science. However, cooling polyatomic molecules with more than six atoms has not yet been achieved. Building on the ide…
View article: Laser excitation of the $^{229}$Th nuclear isomeric transition in a solid-state host
Laser excitation of the $^{229}$Th nuclear isomeric transition in a solid-state host Open
LiSrAlF$_6$ crystals doped with $^{229}$Th are used in a laser-based search for the nuclear isomeric transition. Two spectroscopic features near the nuclear transition energy are observed. The first is a broad excitation feature that produ…
View article: Quantum Vector Signal Analyzer
Quantum Vector Signal Analyzer Open
A technique that allows a harmonic oscillator to be used as a wideband vector signal analyzer is described and demonstrated using a single trapped 40ca+ ion cooled near its motional ground state. Further, the analyzer…
View article: Extending the Large Molecule Limit: The Role of Fermi Resonance in Developing a Quantum Functional Group
Extending the Large Molecule Limit: The Role of Fermi Resonance in Developing a Quantum Functional Group Open
Polyatomic molecules equipped with optical cycling centers (OCCs), enabling continuous photon scattering during optical excitation, are exciting candidates for advancing quantum information science. However, as these molecules grow in size…
View article: Quantum Vector Signal Analyzer: Wideband Electric Field Sensing via Motional Raman Transitions
Quantum Vector Signal Analyzer: Wideband Electric Field Sensing via Motional Raman Transitions Open
Ultrasensitive detection of the frequency, phase, and amplitude of radio frequency (RF) electric fields is central to a variety of important applications, including radio communication, cosmology, dark matter searches, and high-fidelity qu…
View article: Æ codes
Æ codes Open
Diatomic molecular codes [arXiv:1911.00099] are designed to encode quantum information in the orientation of a diatomic molecule, allowing error correction from small torques and changes in angular momentum. Here, we directly study noise n…
View article: Extending the large molecule limit: The role of Fermi resonance in developing a quantum functional group
Extending the large molecule limit: The role of Fermi resonance in developing a quantum functional group Open
Polyatomic molecules equipped with optical cycling centers (OCCs), enabling continuous photon scattering during optical excitation, are exciting candidates for advancing quantum information science. However, as these molecules grow in size…
View article: Eliminating qubit type cross-talk in the $\textit{omg}$ protocol
Eliminating qubit type cross-talk in the $\textit{omg}$ protocol Open
The $\textit{omg}$ protocol is a promising paradigm that uses multiple, application-specific qubit subspaces within the Hilbert space of each single atom during quantum information processing. A key assumption for $\textit{omg}$ operation …