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Huanqian Loh

Visiting Assistant Professor in the Department of Electrical and Computer Engineering
Electrical and Computer Engineering

Selected Publications


Floquet-tailored Rydberg interactions.

Journal Article Nature communications · November 2023 The Rydberg blockade is a key ingredient for entangling atoms in arrays. However, it requires atoms to be spaced well within the blockade radius, which limits the range of local quantum gates. Here we break this constraint using Floquet frequency modulatio ... Full text Cite

Proposal for Observing Yang-Lee Criticality in Rydberg Atomic Arrays.

Journal Article Physical review letters · August 2023 Yang-Lee edge singularities (YLES) are the edges of the partition function zeros of an interacting spin model in the space of complex control parameters. They play an important role in understanding non-Hermitian phase transitions in many-body physics, as ... Full text Cite

2023 roadmap for materials for quantum technologies

Journal Article Materials for Quantum Technology · March 1, 2023 Quantum technologies are poised to move the foundational principles of quantum physics to the forefront of applications. This roadmap identifies some of the key challenges and provides insights on material innovations underlying a range of exciting quantum ... Full text Cite

Parallel Assembly of Arbitrary Defect-Free Atom Arrays with a Multitweezer Algorithm

Journal Article Physical Review Applied · March 1, 2023 Defect-free atom arrays are a precursor for quantum information processing and quantum simulation with neutral atoms. Yet, large-scale defect-free atom arrays can be challenging to realize, due to the losses encountered when rearranging stochastically load ... Full text Cite

D1 magic wavelength tweezers for scaling atom arrays

Journal Article Physical Review Research · October 21, 2021 Full text Cite

Universal graph description for one-dimensional exchange models

Journal Article Physical Review Research · August 24, 2020 Full text Cite

Resonant Dipolar Collisions of Ultracold Molecules Induced by Microwave Dressing.

Journal Article Physical review letters · August 2020 We demonstrate microwave dressing on ultracold, fermionic ^{23}Na^{40}K ground-state molecules and observe resonant dipolar collisions with cross sections exceeding 3 times the s-wave unitarity limit. The origin of these interactions is the resonant alignm ... Full text Cite

Graph-theory treatment of one-dimensional strongly repulsive fermions

Journal Article Physical Review Research · April 20, 2020 Full text Cite

Quantum Parametric Oscillator with Trapped Ions.

Journal Article Physical review letters · October 2017 A strong nonlinear coupling between harmonic oscillators is highly desirable for quantum information processing and quantum simulation, but is difficult to achieve in many physical systems. Here, we exploit the Coulomb interaction between two trapped ions ... Full text Cite

Second-scale nuclear spin coherence time of ultracold 23Na40K molecules.

Journal Article Science (New York, N.Y.) · July 2017 Coherence, the stability of the relative phase between quantum states, is central to quantum mechanics and its applications. For ultracold dipolar molecules at sub-microkelvin temperatures, internal states with robust coherence are predicted to offer rich ... Full text Cite

Coherent Microwave Control of Ultracold ^{23}Na^{40}K Molecules.

Journal Article Physical review letters · June 2016 We demonstrate coherent microwave control of rotational and hyperfine states of trapped, ultracold, and chemically stable ^{23}Na^{40}K molecules. Starting with all molecules in the absolute rovibrational and hyperfine ground state, we study rotational tra ... Full text Cite

Floquet-tailored Rydberg interactions.

Journal Article Nature communications · November 2023 The Rydberg blockade is a key ingredient for entangling atoms in arrays. However, it requires atoms to be spaced well within the blockade radius, which limits the range of local quantum gates. Here we break this constraint using Floquet frequency modulatio ... Full text Cite

Proposal for Observing Yang-Lee Criticality in Rydberg Atomic Arrays.

Journal Article Physical review letters · August 2023 Yang-Lee edge singularities (YLES) are the edges of the partition function zeros of an interacting spin model in the space of complex control parameters. They play an important role in understanding non-Hermitian phase transitions in many-body physics, as ... Full text Cite

2023 roadmap for materials for quantum technologies

Journal Article Materials for Quantum Technology · March 1, 2023 Quantum technologies are poised to move the foundational principles of quantum physics to the forefront of applications. This roadmap identifies some of the key challenges and provides insights on material innovations underlying a range of exciting quantum ... Full text Cite

Parallel Assembly of Arbitrary Defect-Free Atom Arrays with a Multitweezer Algorithm

Journal Article Physical Review Applied · March 1, 2023 Defect-free atom arrays are a precursor for quantum information processing and quantum simulation with neutral atoms. Yet, large-scale defect-free atom arrays can be challenging to realize, due to the losses encountered when rearranging stochastically load ... Full text Cite

D1 magic wavelength tweezers for scaling atom arrays

Journal Article Physical Review Research · October 21, 2021 Full text Cite

Universal graph description for one-dimensional exchange models

Journal Article Physical Review Research · August 24, 2020 Full text Cite

Resonant Dipolar Collisions of Ultracold Molecules Induced by Microwave Dressing.

Journal Article Physical review letters · August 2020 We demonstrate microwave dressing on ultracold, fermionic ^{23}Na^{40}K ground-state molecules and observe resonant dipolar collisions with cross sections exceeding 3 times the s-wave unitarity limit. The origin of these interactions is the resonant alignm ... Full text Cite

Graph-theory treatment of one-dimensional strongly repulsive fermions

Journal Article Physical Review Research · April 20, 2020 Full text Cite

Quantum Parametric Oscillator with Trapped Ions.

Journal Article Physical review letters · October 2017 A strong nonlinear coupling between harmonic oscillators is highly desirable for quantum information processing and quantum simulation, but is difficult to achieve in many physical systems. Here, we exploit the Coulomb interaction between two trapped ions ... Full text Cite

Second-scale nuclear spin coherence time of ultracold 23Na40K molecules.

Journal Article Science (New York, N.Y.) · July 2017 Coherence, the stability of the relative phase between quantum states, is central to quantum mechanics and its applications. For ultracold dipolar molecules at sub-microkelvin temperatures, internal states with robust coherence are predicted to offer rich ... Full text Cite

Coherent Microwave Control of Ultracold ^{23}Na^{40}K Molecules.

Journal Article Physical review letters · June 2016 We demonstrate coherent microwave control of rotational and hyperfine states of trapped, ultracold, and chemically stable ^{23}Na^{40}K molecules. Starting with all molecules in the absolute rovibrational and hyperfine ground state, we study rotational tra ... Full text Cite

Zeeman-splitting-assisted quantum-logic spectroscopy of trapped ions

Journal Article Physical Review A · December 29, 2014 Full text Cite

Microwave control of trapped-ion motion assisted by a running optical lattice.

Journal Article Physical review letters · August 2014 We experimentally demonstrate microwave control of the motional state of a trapped ion placed in a state-dependent potential generated by a running optical lattice. Both the optical lattice depth and the running lattice frequency provide tunability of the ... Full text Cite

State-specific detection of trapped HfF+ by photodissociation

Journal Article Journal of Molecular Spectroscopy · June 2014 Full text Cite

Precision spectroscopy of polarized molecules in an ion trap.

Journal Article Science (New York, N.Y.) · December 2013 Polar molecules are desirable systems for quantum simulations and cold chemistry. Molecular ions are easily trapped, but a bias electric field applied to polarize them tends to accelerate them out of the trap. We present a general solution to this issue by ... Full text Cite

REMPI Spectroscopy of HfF

Preprint · June 21, 2012 Link to item Cite

REMPI spectroscopy of HfF

Journal Article Journal of Molecular Spectroscopy · June 2012 Full text Cite

Near-infrared LIF spectroscopy of HfF

Journal Article Journal of Molecular Spectroscopy · February 2012 Full text Cite

Laser-induced fluorescence studies of HfF+ produced by autoionization.

Journal Article The Journal of chemical physics · October 2011 Autoionization of Rydberg states of HfF, prepared using the optical-optical double resonance technique, holds promise to create HfF(+) in a particular Zeeman level of a rovibronic state for an electron electric dipole moment search. We characterize a vibro ... Full text Cite

Influence of grating parameters on the linewidths of external-cavity diode lasers.

Journal Article Applied optics · December 2006 We investigate experimentally the influence of the grating reflectivity, grating resolution, and diode facet antireflection (AR) coating on the intrinsic linewidth of an external-cavity diode laser built with a diffraction grating in a Littrow configuratio ... Full text Cite

A high-brightness source of narrowband, identical-photon pairs.

Journal Article Science (New York, N.Y.) · July 2006 We generated narrowband pairs of nearly identical photons at a rate of 5 x 10(4) pairs per second from a laser-cooled atomic ensemble inside an optical cavity. A two-photon interference experiment demonstrated that the photons could be made 90% indistingui ... Full text Cite

Flux jumps and H-T diagram of instability for MgB2

Journal Article Journal of Low Temperature Physics · 2003 Full text Cite