Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule (2023)
Journal Article
Guttridge, A., Ruttley, D., Baldock, A., González-Férez, R., Sadeghpour, H., Adams, C., & Cornish, S. (2023). Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule. Physical Review Letters, 131(1), Article 013401. https://doi.org/10.1103/PhysRevLett.131.013401

We demonstrate Rydberg blockade due to the charge-dipole interaction between a single Rb atom and a single RbCs molecule confined in optical tweezers. The molecule is formed by magnetoassociation of a Rb+Cs atom pair and subsequently transferred to t... Read More about Observation of Rydberg blockade due to the charge-dipole interaction between an atom and a polar molecule.

Comparing the hardness of MAX 2-SAT problem instances for quantum and classical algorithms (2023)
Journal Article
Mirkarimi, P., Callison, A., Light, L., Chancellor, N., & Kendon, V. (2023). Comparing the hardness of MAX 2-SAT problem instances for quantum and classical algorithms. Physical Review Research, 5(2), https://doi.org/10.1103/physrevresearch.5.023151

An algorithm for a particular problem may find some instances of the problem easier and others harder to solve, even for a fixed input size. We numerically analyze the relative hardness of MAX 2-SAT problem instances for various continuous-time quant... Read More about Comparing the hardness of MAX 2-SAT problem instances for quantum and classical algorithms.

Formation of Ultracold Molecules by Merging Optical Tweezers (2023)
Journal Article
Ruttley, D. K., Guttridge, A., Spence, S., Bird, R. C., Le Sueur, C. R., Hutson, J. M., & Cornish, S. L. (2023). Formation of Ultracold Molecules by Merging Optical Tweezers. Physical Review Letters, 130(22), https://doi.org/10.1103/physrevlett.130.223401

We demonstrate the formation of a single RbCs molecule during the merging of two optical tweezers, one containing a single Rb atom and the other a single Cs atom. Both atoms are initially predominantly in the motional ground states of their respectiv... Read More about Formation of Ultracold Molecules by Merging Optical Tweezers.

Geographical modelling of language decline (2023)
Journal Article
Brown, D., & Wrathmall, S. (2023). Geographical modelling of language decline. Royal Society Open Science, 10(5), https://doi.org/10.1098/rsos.221045

Competition between languages affects the lives of people all over the globe, and a huge number of languages are at risk of extinction. In this work, statistical physics is applied to modelling the decline of one language in competition with another.... Read More about Geographical modelling of language decline.

Three-body recombination of hydrogen in the early Universe (2023)
Journal Article
Flower, D. (2023). Three-body recombination of hydrogen in the early Universe. Monthly Notices of the Royal Astronomical Society: Letters, 523(1), https://doi.org/10.1093/mnrasl/slad047

It has been suggested recently that three-body recombination of two protons and an electron might be significant in the formation of atomic hydrogen in the early Universe. We demonstrate that this process is completely negligible in the primordial pl... Read More about Three-body recombination of hydrogen in the early Universe.

A practical guide to terahertz imaging using thermal atomic vapour (2023)
Journal Article
Downes, L. A., Torralbo-Campo, L., & Weatherill, K. J. (2023). A practical guide to terahertz imaging using thermal atomic vapour. New Journal of Physics, 25, Article 035002. https://doi.org/10.1088/1367-2630/acb80c

This tutorial aims to provide details on the underlying principles and methodologies of atom-based terahertz imaging techniques. Terahertz imaging is a growing field of research which can provide complementary information to techniques using other re... Read More about A practical guide to terahertz imaging using thermal atomic vapour.

Optical tweezer arrays of strontium atoms (2022)
Thesis
Hill, M. (2022). Optical tweezer arrays of strontium atoms. (Thesis). Durham University

Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit (2022)
Journal Article
Pizzey, D., Briscoe, J. D., Logue, F. D., Ponciano-Ojeda, F. S., Wrathmall, S. A., & Hughes, I. G. (2022). Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit. New Journal of Physics, 24, https://doi.org/10.1088/1367-2630/ac9cfe

The spectroscopy of hot atomic vapours is a hot topic. Many of the work-horse techniques of contemporary atomic physics were first demonstrated in hot vapours. Alkali-metal atomic vapours are ideal media for quantum-optics experiments as they combine... Read More about Laser spectroscopy of hot atomic vapours: from ’scope to theoretical fit.

Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers (2022)
Journal Article
Brooks, R. V., Guttridge, A., Frye, M. D., Ruttley, D. K., Spence, S., Hutson, J. M., & Cornish, S. L. (2022). Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers. New Journal of Physics, 24, Article 113051. https://doi.org/10.1088/1367-2630/ac99f6

We prepare pairs of 133Cs atoms in a single optical tweezer and perform Feshbach spectroscopy for collisions of atoms in the states (f = 3, mf = ±3). We detect enhancements in pair loss using a detection scheme where the optical tweezers are repeated... Read More about Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers.

Rapid readout of terahertz orbital angular momentum beams using atom-based imaging (2022)
Journal Article
Downes, L. A., Whiting, D. J., Adams, C. S., & Weatherill, K. J. (2022). Rapid readout of terahertz orbital angular momentum beams using atom-based imaging. Optics Letters, 47(22), 6001-6004. https://doi.org/10.1364/ol.476945

We demonstrate the rapid readout of terahertz orbital angular momentum (OAM) beams using an atomic-vapor-based imaging technique. OAM modes with both azimuthal and radial indices are created using phase-only transmission plates. The beams undergo ter... Read More about Rapid readout of terahertz orbital angular momentum beams using atom-based imaging.

Observation of magnetic Feshbach resonances between Cs and 173Yb (2022)
Journal Article
Franzen, T., Guttridge, A., Wilson, K. E., Segal, J., Frye, M. D., Hutson, J. M., & Cornish, S. L. (2022). Observation of magnetic Feshbach resonances between Cs and 173Yb. Physical Review Research, 4(4), Article 043072. https://doi.org/10.1103/physrevresearch.4.043072

We report the observation of magnetic Feshbach resonances between 173 Yb and 133 Cs . In a mixture of Cs atoms prepared in the ( f = 3 , m f = 3 ) state and unpolarized fermionic 173 Yb , we observe resonant atom loss due to two sets of magnetic Fesh... Read More about Observation of magnetic Feshbach resonances between Cs and 173Yb.

Controller-Based Energy-Aware Wireless Sensor Network Routing Using Quantum Algorithms (2022)
Journal Article
Chen, J., Date, P., Chancellor, N., Atiquzzaman, M., & Sreenan, C. (2022). Controller-Based Energy-Aware Wireless Sensor Network Routing Using Quantum Algorithms. IEEE Transactions on Quantum Engineering, 3, https://doi.org/10.1109/tqe.2022.3217297

Energy-efficient routing in wireless sensor networks has attracted attention from researchers in both academia and industry, most recently motivated by the opportunity to use software-defined network-inspired approaches. These problems are NP-hard, w... Read More about Controller-Based Energy-Aware Wireless Sensor Network Routing Using Quantum Algorithms.

Preparation of 87Rb and 133Cs in the motional ground state of a single optical tweezer (2022)
Journal Article
Spence, S., Brooks, R., Ruttley, D., Guttridge, A., & Cornish, S. (2022). Preparation of 87Rb and 133Cs in the motional ground state of a single optical tweezer. New Journal of Physics, 24, https://doi.org/10.1088/1367-2630/ac95b9

We report simultaneous Raman sideband cooling of a single 87Rb atom and a single 133Cs atom held in separate optical tweezers at 814 nm and 938 nm, respectively. Starting from outside the Lamb-Dicke regime, after 45 ms of cooling we measure probabili... Read More about Preparation of 87Rb and 133Cs in the motional ground state of a single optical tweezer.

Diatomic-py: A Python module for calculating the rotational and hyperfine structure of 1Σ molecules (2022)
Journal Article
Blackmore, J. A., Gregory, P. D., Hutson, J. M., & Cornish, S. L. (2023). Diatomic-py: A Python module for calculating the rotational and hyperfine structure of 1Σ molecules. Computer Physics Communications, 282, Article 108512. https://doi.org/10.1016/j.cpc.2022.108512

We present a computer program to calculate the quantised rotational and hyperfine energy levels of diatomic molecules in the presence of dc electric, dc magnetic, and off-resonant optical fields. Our program is applicable to the bialkali molecules us... Read More about Diatomic-py: A Python module for calculating the rotational and hyperfine structure of 1Σ molecules.

Modernizing quantum annealing II: genetic algorithms with the inference primitive formalism (2022)
Journal Article
Chancellor, N. (2023). Modernizing quantum annealing II: genetic algorithms with the inference primitive formalism. Natural Computing, 22, 737–752. https://doi.org/10.1007/s11047-022-09905-2

Quantum annealing, a method of computing where optimization and machine learning problems are mapped to physically implemented energy landscapes subject to quantum fluctuations, allows for these fluctuations to be used to assist in finding the soluti... Read More about Modernizing quantum annealing II: genetic algorithms with the inference primitive formalism.

Soliton Interferometry with Very Narrow Barriers Obtained from Spatially Dependent Dressed States (2022)
Journal Article
Grimshaw, C. L., Billam, T. P., & Gardiner, S. A. (2022). Soliton Interferometry with Very Narrow Barriers Obtained from Spatially Dependent Dressed States. Physical Review Letters, 129(4), Article 040401. https://doi.org/10.1103/physrevlett.129.040401

Bright solitons in atomic Bose-Einstein condensates are strong candidates for high precision matter-wave interferometry, as their inherent stability against dispersion supports long interrogation times. An analog to a beam splitter is then a narrow p... Read More about Soliton Interferometry with Very Narrow Barriers Obtained from Spatially Dependent Dressed States.

Hybrid quantum-classical algorithms in the noisy intermediate-scale quantum era and beyond (2022)
Journal Article
Callison, A., & Chancellor, N. (2022). Hybrid quantum-classical algorithms in the noisy intermediate-scale quantum era and beyond. Physical Review A, 106(1), Article 010101. https://doi.org/10.1103/physreva.106.010101

Hybrid quantum-classical algorithms are central to much of the current research in quantum computing, particularly when considering the noisy intermediate-scale quantum (NISQ) era, with a number of experimental demonstrations having already been perf... Read More about Hybrid quantum-classical algorithms in the noisy intermediate-scale quantum era and beyond.

Error measurements for a quantum annealer using the one-dimensional Ising model with twisted boundaries (2022)
Journal Article
Chancellor, N., Crowley, P. J., Durić, T., Vinci, W., Amin, M. H., Green, A. G., …Aeppli, G. (2022). Error measurements for a quantum annealer using the one-dimensional Ising model with twisted boundaries. npj Quantum Information, 8(1), Article 73. https://doi.org/10.1038/s41534-022-00580-w

A finite length ferromagnetic chain with opposite spin polarization imposed at its two ends is one of the simplest frustrated spin models. In the clean classical limit the domain wall inserted on account of the boundary conditions resides with equal... Read More about Error measurements for a quantum annealer using the one-dimensional Ising model with twisted boundaries.

Better magneto-optical filters with cascaded vapor cells (2022)
Journal Article
Logue, F. D., Briscoe, J. D., Pizzey, D., Wrathmall, S. A., & Hughes, I. G. (2022). Better magneto-optical filters with cascaded vapor cells. Optics Letters, 47(12), 2975-2978. https://doi.org/10.1364/ol.459291

Single-cell magneto-optical Faraday filters find great utility and are realized with either ‘wing’ or ‘line center’ spectral profiles. We show that cascading a second cell with independent axial (Faraday) or transverse (Voigt) magnetic field leads to... Read More about Better magneto-optical filters with cascaded vapor cells.

Purcell-enhanced dipolar interactions in nanostructures (2022)
Journal Article
Skljarow, A., Kübler, H., Adams, C., Pfau, T., Löw, R., & Alaeian, H. (2022). Purcell-enhanced dipolar interactions in nanostructures. Physical Review Research, 4(2), https://doi.org/10.1103/physrevresearch.4.023073

Strong light-induced interactions between atoms are known to cause nonlinearities at a few-photon level, which are crucial for applications in quantum information processing. Compared to free space, the scattering and the light-induced dipolar intera... Read More about Purcell-enhanced dipolar interactions in nanostructures.