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Cooperative ordering in lattices of interacting two-level dipoles (2015)
Journal Article
Bettles, R., Gardiner, S., & Adams, C. (2015). Cooperative ordering in lattices of interacting two-level dipoles. Physical Review A, 92(6), Article 063822. https://doi.org/10.1103/physreva.92.063822

We investigate the cooperative behavior of regular monolayers of driven two-level dipoles, using classical electrodynamics simulations. The dipolar response results from the interference of many cooperative eigenmodes, each frequency-shifted from the... Read More about Cooperative ordering in lattices of interacting two-level dipoles.

Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms (2015)
Journal Article
Barredo, D., Labuhn, H., Rayets, S., Lahaye, T., Browaeys, A., & Adams, C. (2015). Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms. Physical Review Letters, 114(11), Article 113002. https://doi.org/10.1103/physrevlett.114.113002

We study coherent excitation hopping in a spin chain realized using highly excited individually addressable Rydberg atoms. The dynamics are fully described in terms of an XY spin Hamiltonian with a long range resonant dipole-dipole coupling that scal... Read More about Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms.

Optical Response of Gas-Phase Atoms at Less than λ/80 from a Dielectric Surface (2014)
Journal Article
Whittaker, K., Keaveney, J., Hughes, I., Sargsyan, A., Sarkisyan, D., & Adams, C. (2014). Optical Response of Gas-Phase Atoms at Less than λ/80 from a Dielectric Surface. Physical Review Letters, 112, Article 253201. https://doi.org/10.1103/physrevlett.112.253201

We present experimental observations of atom-light interactions within tens of nanometers (down to 11 nm) of a sapphire surface. Using photon counting we detect the fluorescence from of order one thousand Rb or Cs atoms, confined in a vapor with thic... Read More about Optical Response of Gas-Phase Atoms at Less than λ/80 from a Dielectric Surface.

Microwave control of the interaction between two optical photons (2014)
Journal Article
Maxwell, D., Szwer, D., Barato, D., Busche, H., Pritchard, J., Gauguet, A., …Adams, C. (2014). Microwave control of the interaction between two optical photons. Physical Review A, 89(4), Article 043827. https://doi.org/10.1103/physreva.89.043827

A microwave field is used to control the interaction between pairs of optical photons stored in highly excited collective states (Rydberg polaritons). We show that strong dipole-dipole interactions induced by the microwave field destroy the coherence... Read More about Microwave control of the interaction between two optical photons.

All-optical quantum information processing using Rydberg gates (2014)
Journal Article
Paredes-Barato, D., & Adams, C. (2014). All-optical quantum information processing using Rydberg gates. Physical Review Letters, 112(4), Article 040501. https://doi.org/10.1103/physrevlett.112.040501

In this Letter, we propose a hybrid scheme to implement a photonic controlled-z (CZ) gate using photon storage in highly excited Rydberg states, which controls the effective photon-photon interaction using resonant microwave fields. Our scheme decoup... Read More about All-optical quantum information processing using Rydberg gates.

Number-resolved imaging of excited-state atoms using a scanning autoionization microscope (2013)
Journal Article
Lochead, G., Boddy, D., Sadler, D., Adams, C., & Jones, M. (2013). Number-resolved imaging of excited-state atoms using a scanning autoionization microscope. Physical Review A, 87(5), Article 053409. https://doi.org/10.1103/physreva.87.053409

We report on a scanning microscopy technique for atom-number-resolved imaging of excited-state atoms. A tightly focused laser beam leads to local autoionization and the resulting ions are counted electronically. Scanning the beam across the cloud bui... Read More about Number-resolved imaging of excited-state atoms using a scanning autoionization microscope.

Storage and Control of Optical Photons Using Rydberg Polaritons (2013)
Journal Article
Maxwell, D., Szwer, D., Paredes-Barato, D., Busche, H., Pritchard, J., Gauguet, A., …Adams, C. (2013). Storage and Control of Optical Photons Using Rydberg Polaritons. Physical Review Letters, 110(10), Article 103001. https://doi.org/10.1103/physrevlett.110.103001

We use a microwave field to control the quantum state of optical photons stored in a cold atomic cloud. The photons are stored in highly excited collective states (Rydberg polaritons) enabling both fast qubit rotations and control of photon-photon in... Read More about Storage and Control of Optical Photons Using Rydberg Polaritons.

Three-photon electromagnetically induced transparency using Rydberg states (2012)
Journal Article
Carr, C., Tanasittikosol, M., Sargsyan, A., Sarkisyan, D., Adams, C., & Weatherill, K. (2012). Three-photon electromagnetically induced transparency using Rydberg states. Optics Letters, 37(18), 3858-3860

We demonstrate electromagnetically induced transparency in a four-level cascade system where the upper level is a Rydberg state. The observed spectral features are sub-Doppler and can be enhanced due to the compensation of Doppler shifts with AC Star... Read More about Three-photon electromagnetically induced transparency using Rydberg states.

Optical preparation and measurement of atomic coherence at gigahertz bandwidth (2012)
Journal Article
Siddons, P., Adams, C., & Hughes, I. (2012). Optical preparation and measurement of atomic coherence at gigahertz bandwidth. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(12), https://doi.org/10.1088/0953-4075/45/12/124009

We detail a method for the preparation of atomic coherence in a high-density atomic vapour of 87Rb, utilizing a coherent preparation scheme of off-resonant gigahertz bandwidth pulses. The scheme is found to be faster and more effective than technique... Read More about Optical preparation and measurement of atomic coherence at gigahertz bandwidth.

Measuring the Stokes parameters for light transmitted by a high-density rubidium vapour in large magnetic fields (2012)
Journal Article
Weller, L., Dalton, T., Siddons, P., Adams, C., & Hughes, I. (2012). Measuring the Stokes parameters for light transmitted by a high-density rubidium vapour in large magnetic fields. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(5), Article 055001. https://doi.org/10.1088/0953-4075/45/5/055001

Here we report on measurements of the absolute absorption and dispersion of light in a dense rubidium vapour on the D2 line in the weak-probe regime with an applied magnetic field. A model for the electric susceptibility of the vapour is presented wh... Read More about Measuring the Stokes parameters for light transmitted by a high-density rubidium vapour in large magnetic fields.

Polarization spectroscopy of an excited state transition (2012)
Journal Article
Carr, C., Adams, C., & Weatherill, K. (2012). Polarization spectroscopy of an excited state transition. Optics Letters, 37(1), 118-120. https://doi.org/10.1364/ol.37.000118

We demonstrate polarization spectroscopy of an excited state transition in room-temperature cesium vapor. An anisotropy induced by a circularly polarized pump beam on the D2 transition is observed using a weak probe on the 6P3/2→7S1/2 transition. At... Read More about Polarization spectroscopy of an excited state transition.

Correlated Photon Emission from Multiatom Rydberg Dark States (2012)
Journal Article
Pritchard, J., Adams, C., & Molmer, K. (2012). Correlated Photon Emission from Multiatom Rydberg Dark States. Physical Review Letters, 108(4), Article 043601. https://doi.org/10.1103/physrevlett.108.043601

We consider three-level atoms driven by two resonant light fields in a ladder scheme where the upper level is a highly excited Rydberg state. We show that the dipole-dipole interactions between Rydberg excited atoms prevents the formation of single p... Read More about Correlated Photon Emission from Multiatom Rydberg Dark States.