Fluctuation spectroscopy by tunable energy compensation

A new method for investigating fluctuations in macroscopic coherences is suggested and demonstrated by measurement of radiator reorientation kernels in Stark-tunable infrared transitions of $^{13}\mathrm{C}$ ${\mathrm{H}}_{3}$ F. The dominant ($\ensuremath{\Delta}M=1$) kernel is obtained by a scale transformation from the shape of a curve of two-pulse photon-echo intensity versus Stark voltage, at fixed large echo time delay.A new method for investigating fluctuations in macroscopic coherences is suggested and demonstrated by measurement of radiator reorientation kernels in Stark-tunable infrared transitions of $^{13}\mathrm{C}$${\mathrm{H}}_{3}$F. The dominant ($\ensuremath{\Delta}M=1$) kernel is obtained by a scale transformation from the shape of a curve of two-pulse photon-echo intensity versus Stark voltage, at fixed large echo time delay.

Physical Review LettersDec 9, 198514 citations

Energy fluctuation relations and repeated quantum measurements

Stefano Gherardini, Lorenzo Buffoni, Guido Giachetti +2 more

arXiv:2202.02593Chaos Solitons & FractalsFeb 12, 20226 citations

Radiator reorientation kernels by tunable energy compensation

John E. Thomas, J. M. Liang, Ramachandra Rao Dasari

We describe a new Stark sublevel photon echo technique for measuring fluctuations in macroscopic coherences. This idea is applied to the Stark tunable infrared (λ = 9 μm) R(4, 3, V3 = 0 → 1) transition of 13CH3F to measure, for the first time, the radiator reorientation velocity changing kernels WΔ M (Δv) which describe the rates (per unit velocity) at which the radiator orientation M changes by an amount ΔM accompanied by a velocity change Δv.1 In the experiments, two pulse photon echoes are obtained using a laser field polarized along an applied weak de Stark field ( z ^ direction) which shifts each M transition by Mvs (Hz).We describe a new Stark sublevel photon echo technique for measuring fluctuations in macroscopic coherences. This idea is applied to the Stark tunable infrared (λ = 9 μm) R(4, 3, V3 = 0 → 1) transition of 13CH3F to measure, for the first time, the radiator reorientation velocity changing kernels WΔ M (Δv) which describe the rates (per unit velocity) at which the radiator orientation M changes by an amount ΔM accompanied by a velocity change Δv.1 In the experiments, two pulse photon echoes are obtained using a laser field polarized along an applied weak de Stark field ( z ^ direction) which shifts each M transition by Mvs (Hz).

Annual Meeting Optical Society of AmericaJan 1, 19860 citations

Electrically driven source of time-energy entangled photons based on a self-pumped silicon microring resonator

Francesco Garrisi, Federico Andrea Sabattoli, Savda Sam +8 more

Time-energy entangled photon pairs are fundamental resources for quantum communication protocols since they are robust against environmental fluctuations in optical fiber networks. Pair sources based on spontaneous four-wave mixing in silicon microring resonators usually employ expensive external tunable lasers to compensate for ambient fluctuations; adopting self-pumped configurations, instead, lifts the need for such external source. Here we demonstrate the emission of time-energy entangled photon pairs at telecom wavelengths from a silicon self-pumped ring, obtaining a Franson interference fringe with 93.9 % ± 0.9 % visibility.Time-energy entangled photon pairs are fundamental resources for quantum communication protocols since they are robust against environmental fluctuations in optical fiber networks. Pair sources based on spontaneous four-wave mixing in silicon microring resonators usually employ expensive external tunable lasers to compensate for ambient fluctuations; adopting self-pumped configurations, instead, lifts the need for such external source. Here we demonstrate the emission of time-energy entangled photon pairs at telecom wavelengths from a silicon self-pumped ring, obtaining a Franson interference fringe with 93.9 % ± 0.9 % visibility.

Optics LettersApr 14, 20206 citations

Momentum-resolved magnetic noise spectroscopy using ensembles of diamond quantum sensors

Zeeshawn Kazi, Kai-Hung Cheng, Jared Rovny +1 more

Spatiotemporal fluctuations across multiple scales govern and characterize the emergent properties, phase boundaries, and low-energy excitations of strongly correlated matter. However, capturing these dynamics has remained a major experimental challenge, as conventional probes typically offer either high spatial or temporal resolution, but not both simultaneously. Here, we leverage high-fidelity wide-field imaging of dense diamond nitrogen vacancy center ensembles to measure the momentum and frequency power spectral density of magnetic fluctuations. To access spatial wavevectors below the diffraction limit, we tune the sensing volume continuously through optical depletion. This approach enables study of equilibrium and driven fluctuations across three orders of magnitude in spatial scale and tunable frequency bands, providing a direct means to map low-energy, long-wavelength fluctuations in correlated systems.Spatiotemporal fluctuations across multiple scales govern and characterize the emergent properties, phase boundaries, and low-energy excitations of strongly correlated matter. However, capturing these dynamics has remained a major experimental challenge, as conventional probes typically offer either high spatial or temporal resolution, but not both simultaneously. Here, we leverage high-fidelity wide-field imaging of dense diamond nitrogen vacancy center ensembles to measure the momentum and frequency power spectral density of magnetic fluctuations. To access spatial wavevectors below the diffraction limit, we tune the sensing volume continuously through optical depletion. This approach enables study of equilibrium and driven fluctuations across three orders of magnitude in spatial scale and tunable frequency bands, providing a direct means to map low-energy, long-wavelength fluctuations in correlated systems.

quant-pharXiv:2609.09571Sep 10, 20260 citations

A new method for investigating fluctuations in macroscopic coherences is suggested and demonstrated by measurement of radiator reorientation kernels in Stark-tunable infrared transitions of

^{13}\mathrm{C}

{\mathrm{H}}_{3}

F. The dominant ($\ensuremath{\Delta}M=1$) kernel is obtained by a scale transformation from the shape of a curve of two-pulse photon-echo intensity versus Stark voltage, at fixed large echo time delay.