Research

Recent research highlights

Optomechnical self-organization in a mesoscopic atom array

Collaborators at Berkeley investigated self-organization in a driven tweezer array inside a cavity. At some critical drive strength, the light scattered by the atoms into the cavity provides a deeper potential than the tweezers, and they all shift their positions in a synchronized manner. While well established for bulk gases, the tweezer array allows for exploration with a small fixed number of atoms, and the observation of mesoscopic signatures of phase transitions.

Read the arXiv preprint here!

Generating photonic entangled states using decoherence free subspaces

We devised a protocol to deterministically generate strings of entangled photons. We propose using a set of dark collective states generated by three quantum emitters coupled to a waveguide truncated in one direction by a mirror. By performing gates on the collective states, we show how to entangle the emitted photons and create states such as GHZ states and cluster states, with potential applications in metrology and quantum computing.

For more details see the arXiv preprint here!

Modification of branching ratios by collective many-body decay

We explored the physics of collective decay from an excited state with multiple decay paths. We showed that decay from a fully inverted collective state depends not only on the branching ratios between decay paths but the number of emitters, tending to be completely dominated by the most likely path as the emitter number becomes very large. We highlighted the potential use of collective decay for photoassociation of ultracold molecules.

Read about it in Physical Review Research!

Alkaline-earth atoms as a platform to study many-body quantum optics

We considered arrays of alkaline-earth atoms for many-body quantum optics, as the presence of long-wavelength transitions allows these atoms to be spaced relatively very close. We showed that Dicke superradiance manifests in experimentally feasible arrays, despite the complicated level structure, and in fact allows for the modification of decay ratios. Our work highlights the potential resource of alkaline-earth atom arrays as quantum optical devices.

Read more here in PRX Quantum!

Subradiant and superradiant scattering from a tweezer array into a cavity

In this experiment, collaborators at UC Berkeley used optical tweezers to trap an array of atoms inside an optical cavity and drove them with light. By controlling the atomic positions, they were able to control the interference pattern of the atoms' scattered light. They demonstrated both constructive and destructive interference, in part thanks to a magic wavelength we found that helps simplify the complicated atomic level structure.

Read about the scattering experiment in PRL and the magic wavelength in PRA!

Full list of preprints and publications

J Ho, Y-H Lu, T Xiang, CC Rusconi, SJ Masson, A Asenjo-Garcia, Z Yan and DM Stamper-Kurn

Optomechanical self-organization in a mesoscopic atom array

arXiv:2410.12754 (2024)

O Rubies-Bigorda, SJ Masson, SF Yelin and A Asenjo-Garcia

Deterministic generation of photonic entangled states using decoherence-free subspaces

arXiv:2410.03325 (2024)

W-K Mok, SJ Masson, DM Stamper-Kurn, T Zelevinsky and A Asenjo-Garcia

Collective transition quenching in the presence of multiple competing decay channels

Physical Review Research 9, L022015 (2025)

SJ Masson, Z Yan, J Ho, Y-H Lu, DM Stamper-Kurn and A Asenjo-Garcia

State-insensitive wavelengths for light shifts and photon scattering from Zeeman states

Physical Review A 109, 063105 (2024)

SJ Masson, JP Covey, S Will and A Asenjo-Garcia

Dicke superradiance in ordered arrays of multilevel atoms

PRX Quantum 5, 010344 (2024)

Z Yan, J Ho, Y-H Lu, SJ Masson, A Asenjo-Garcia and DM Stamper-Kurn

Superradiant and subradiant cavity scattering by atom arrays

Physical Review Letters 131, 253603 (2023)

S Cardenas-Lopez, SJ Masson, Z Zager and A Asenjo-Garcia

Many-body superradiance and dynamical symmetry breaking in waveguide QED

Physical Review Letters 131, 033605 (2023)

X Huang, W Yuan, A Holman, M Kwon, SJ Masson, R Gutiérrez-Jáuregui, A Asenjo-Garcia, S Will and N Yu

Metasurface holographic optical traps for ultracold atoms

Progress in Quantum Electronics 89, 100470 (2023)

E Sierra, SJ Masson and A Asenjo-Garcia

Dicke Superradiance in Ordered Lattices: Dimensionality Matters

Physical Review Research 4, 023207 (2022)

SJ Masson and A Asenjo-Garcia

University of Dicke superradiance in arrays of quantum emitters

Nature Communications 13, 2285 (2022)

A Giraldo, SJ Masson, NGR Broderick and B Krauskopf

Semiclassical bifurcations and quantum trajectories: a case study of the open Bose-Hubbard dimer

The European Physical Journal Special Topics 231, 385-401 (2022)

C Groiseau, SJ Masson and AS Parkins

Generation of spin cat states in an engineered Dicke model

Physical Review A 104, 053721 (2021)

C Groiseau, AEJ Elliott, SJ Masson and AS Parkins

Proposal for a Deterministic Single-Atom Source of Quasisuperradiant N-photon pulses

Physical Review Letters 127, 033602 (2021)

SJ Masson, I Ferrier-Barbut, LA Orozco, A Browaeys and A Asenjo-Garcia

Many-body Signatures of Collective Decay in Atomic Chains

Physical Review Letters 125, 263601 (2020)

KC Stitely, SJ Masson, A Giraldo, B Krauskopf and AS Parkins

Superradiant switching, quantum hysteresis, and oscillations in a generalized Dicke model

Physical Review A 102, 063702 (2020)

SJ Masson and A Asenjo-Garcia

Atomic-waveguide quantum electrodynamics

Physical Review Research 2, 043213 (2020)

SJ Masson and AS Parkins

Rapid Production of Many-body Entanglement in Spin-1 Atoms via Cavity Output Photon Counting

Physical Review Letters 122, 103601 (2019)

SJ Masson and AS Parkins

Extreme spin squeezing in the steady state of a generalized Dicke model

Physical Review A 99, 023822 (2019)

SJ Masson and AS Parkins

Preparing the spin-singlet state of a spinor gas in an optical cavity

Physical Review A 99, 013819 (2019)

Z Zhang, CH Lee, R Kumar, KJ Arnold, SJ Masson, AL Grimsmo, AS Parkins and MD Barrett

Dicke-model simulation via cavity-assisted Raman transitions

Physical Review A 97, 043858 (2018)

SJ Masson, MD Barrett and AS Parkins

Cavity QED Engineering of Spin Dynamics and Squeezing in a Spinor Gas

Physical Review Letters 119, 213601 (2017)

Z Zhang, CH Lee, R Kumar, KJ Arnold, SJ Masson, AS Parkins and MD Barrett

Non-equilibrium phase transitions in a spin-1 Dicke model

Optica 4, 424 (2017)

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