Ofer Firstenberg
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View article: Coherent polarization self-rotation
Coherent polarization self-rotation Open
We introduce and study coherent polarization self-rotation (CPSR), a two-photon light-matter interaction in dense alkali-metal vapors that enables both narrowband optical spectroscopy of magnetic transitions and coherent coupling between l…
View article: Quantum nonlinear optics with counter-propagating photons
Quantum nonlinear optics with counter-propagating photons Open
Realizing strong interactions between individual photons is a cornerstone for advancing photonic quantum computing and quantum nonlinear optics. Here, we experimentally demonstrate strong interactions between counter-propagating photons me…
View article: Quantum CNOT Gate with Actively Synchronized Photon Pairs
Quantum CNOT Gate with Actively Synchronized Photon Pairs Open
Controlling the synchronization of photons from probabilistic quantum sources plays a pivotal role in advancing efficient quantum information processing. We report the realization of a probabilistic entangling gate operating on actively sy…
View article: Multiband dispersion and warped vortices of strongly-interacting photons
Multiband dispersion and warped vortices of strongly-interacting photons Open
We study quantum correlations between interacting photons realized through co-propagating Rydberg polaritons. We show that the evolution of the $n$-photon wavefunction is governed by a multiband dispersion featuring one massive mode and $n…
View article: Efficient coupling of light to an atomic tweezer array in a cavity
Efficient coupling of light to an atomic tweezer array in a cavity Open
We consider the coupling of light, via an optical cavity, to two-dimensional atomic arrays whose lattice spacing exceeds the wavelength of the light. Such “superwavelength” spacing is typical of optical tweezer arrays. While subwavelength …
View article: Quantum interfaces with multilayered superwavelength atomic arrays
Quantum interfaces with multilayered superwavelength atomic arrays Open
We consider quantum light-matter interfaces comprised of multiple layers of two-dimensional atomic arrays, whose lattice spacings exceed the wavelength of light. While the coupling of light to a single layer of such a ``superwavelength" la…
View article: Coupling light to an atomic tweezer array in a cavity
Coupling light to an atomic tweezer array in a cavity Open
We consider the coupling of light, via an optical cavity, to two-dimensional atomic arrays whose lattice spacing exceeds the wavelength of the light. Such 'superwavelength' spacing is typical of optical tweezer arrays. While subwavelength …
View article: Transition Metal Ion Ensembles in Crystals as Solid-State Coherent Spin-Photon Interfaces: The Case of Nickel in Magnesium Oxide
Transition Metal Ion Ensembles in Crystals as Solid-State Coherent Spin-Photon Interfaces: The Case of Nickel in Magnesium Oxide Open
We present general guidelines for finding solid-state systems that could serve as coherent electron-spin-photon interfaces even at relatively high temperatures, where phonons are abundant but cooling is easier, and show that transition-met…
View article: Supersensitive phase estimation by thermal light in a Kerr-nonlinear interferometric setup
Supersensitive phase estimation by thermal light in a Kerr-nonlinear interferometric setup Open
Estimation of the phase delay between interferometer arms is the core of transmission phase microscopy. Such phase estimation may exhibit an error below the standard quantum (shot-noise) limit, if the input is an entangled two-mode state, …
View article: Quantum vortices of strongly interacting photons
Quantum vortices of strongly interacting photons Open
Experimental data: We use a .csv file format for all data sets. File names follow the figure numbers in the main text, and each figure is associated with separate x-axis and y-axis files. Matlab .fig and .svg files are also included for al…
View article: Quantum vortices of strongly interacting photons
Quantum vortices of strongly interacting photons Open
Experimental data: We use a .csv file format for all data sets. File names follow the figure numbers in the main text, and each figure is associated with separate x-axis and y-axis files. Matlab .fig and .svg files are also included for al…
View article: Single-photon synchronization with a room-temperature atomic quantum memory
Single-photon synchronization with a room-temperature atomic quantum memory Open
Efficient synchronization of single photons that are compatible with narrowband atomic transitions is an outstanding challenge, which could prove essential for photonic quantum information processing. Here we report on the synchronization …
View article: A practical guide to electromagnetically induced transparency in atomic vapor
A practical guide to electromagnetically induced transparency in atomic vapor Open
This tutorial introduces the theoretical and experimental basics of electromagnetically induced transparency (EIT) in thermal alkali vapors. We first give a brief phenomenological description of EIT in simple three-level systems of station…
View article: Quantum vortices of strongly interacting photons
Quantum vortices of strongly interacting photons Open
Vortices are a hallmark of topologically nontrivial dynamics in nonlinear physics and arise in a huge variety of systems, from space and atmosphere to condensed matter and quantum gases. In optics, vortices manifest as phase twists of the …
View article: Bright, low-noise source of single photons at 780 nm with improved phase-matching in rubidium vapor
Bright, low-noise source of single photons at 780 nm with improved phase-matching in rubidium vapor Open
Future optical quantum networks could benefit from single photons that couple well to atoms, for realizing, e.g., quantum memories and deterministic photonic gates. However, the efficient generation of such photons remains a difficult chal…
View article: Nonlinear coherent heat machines
Nonlinear coherent heat machines Open
We propose heat machines that are nonlinear, coherent, and closed systems composed of few field (oscillator) modes. Their thermal-state input is transformed by nonlinear Kerr interactions into nonthermal (non-Gaussian) output with controll…
View article: Transition metal ion ensembles in crystals as solid-state coherent spin-photon interfaces: The case of nickel in magnesium oxide
Transition metal ion ensembles in crystals as solid-state coherent spin-photon interfaces: The case of nickel in magnesium oxide Open
We present general guidelines for finding solid-state systems that could serve as coherent electron spin-photon interfaces even at relatively high temperatures, where phonons are abundant but cooling is easier, and show that transition met…
View article: Fast, noise-free atomic optical memory with 35% end-to-end efficiency
Fast, noise-free atomic optical memory with 35% end-to-end efficiency Open
Coherent optical memories will likely play an important role in future quantum communication networks. Among the different platforms, memories based on ladder-type orbital transitions in atomic gasses offer high bandwidth ($>100$ MHz), con…
View article: Anomalous optical drag
Anomalous optical drag Open
A moving dielectric medium can displace the optical path of light passing through it, a phenomenon known as the Fresnel-Fizeau optical drag effect. The resulting displacement is proportional to the medium's velocity. In this article, we re…
View article: A practical guide to electromagnetically induced transparency in atomic vapor
A practical guide to electromagnetically induced transparency in atomic vapor Open
This tutorial introduces the theoretical and experimental basics of Electromagnetically Induced Transparency (EIT) in thermal alkali vapors. We first introduce a brief phenomenological description of EIT in simple three-level systems of st…
View article: Optical quantum memory for noble-gas spins based on spin-exchange collisions
Optical quantum memory for noble-gas spins based on spin-exchange collisions Open
Optical quantum memories, which store and preserve the quantum state of photons, rely on a coherent mapping of the photonic state onto matter states that are optically accessible. Here we outline and characterize schemes to map the state o…
View article: Quantum Interface for Noble-Gas Spins Based on Spin-Exchange Collisions
Quantum Interface for Noble-Gas Spins Based on Spin-Exchange Collisions Open
An ensemble of noble-gas nuclear spins is a unique quantum system that could\nmaintain coherence for many hours at room temperature and above, owing to\nexceptional isolation from the environment. This isolation, however, is a mixed\nbless…
View article: Critical dynamics and phase transition of a strongly interacting warm spin gas
Critical dynamics and phase transition of a strongly interacting warm spin gas Open
Significance Investigation of new phases of matter and, generally, the study of correlated states of many particles are at the frontier of interdisciplinary physical research. Ordered phases are extensively studied in condensed matter and …
View article: Nonlinear coherent heat machines and closed-system thermodynamics
Nonlinear coherent heat machines and closed-system thermodynamics Open
All existing heat machines are dissipative open systems. Hence, they cannot operate fully coherently. We propose to replace this conventional thermodynamic paradigm by a completely different one, whereby heat machines are nonlinear coheren…
View article: Nonlinear interferometry enables coherent heat machine operation
Nonlinear interferometry enables coherent heat machine operation Open
We propose a novel principle of operating heat machines in a fully unitary (coherent) fashion by mixing few hot and cold thermal field modes in nonlinear interferometers. Such devices, specifically, interferometers containing Kerr-nonlinea…
View article: Bright multiplexed source of indistinguishable single photons with tunable GHz-bandwidth at room temperature
Bright multiplexed source of indistinguishable single photons with tunable GHz-bandwidth at room temperature Open
Narrowband single photons that couple well to atomic ensembles could prove essential for future quantum networks, but the efficient generation of such photons remains an outstanding challenge. We realize a spatially-multiplexed heralded so…
View article: Strong coupling of alkali spins to noble-gas spins with hour-long coherence time
Strong coupling of alkali spins to noble-gas spins with hour-long coherence time Open
Nuclear spins of noble gases can maintain coherence for hours at ambient conditions owing to their extraordinary isolation by the enclosing, complete electronic shells. This isolation, however, impedes the ability to manipulate and control…
View article: Super-extended nanofiber-guided field for coherent interaction with hot atoms
Super-extended nanofiber-guided field for coherent interaction with hot atoms Open
We fabricate an extremely thin optical fiber that supports a super-extended mode with a diameter as large as 13 times the optical wavelength, residing almost entirely outside the fiber and guided over thousands of wavelengths (5 mm), to co…