Article
Optics
Danilo Zia, Nazanin Dehghan, Alessio D'Errico, Fabio Sciarrino, Ebrahim Karimi
Summary: Biphoton digital holography is a method that uses coincidence imaging to retrieve amplitude and phase information of an unknown biphoton state. This approach allows for a more efficient and reliable characterization of high-dimensional biphoton states. The proposed reconstruction technique achieves a three orders of magnitude faster measurement time and an average fidelity of 87% compared to previous experiments.
Article
Multidisciplinary Sciences
Michael K. L. Man, Julien Madeo, Chakradhar Sahoo, Kaichen Xie, Marshall Campbell, Vivek Pareek, Arka Karmakar, E. Laine Wong, Abdullah Al-Mahboob, Nicholas S. Chan, David R. Bacon, Xing Zhu, Mohamed M. M. Abdelrasoul, Xiaoqin Li, Tony F. Heinz, Felipe H. da Jornada, Ting Cao, Keshav M. Dani
Summary: This study directly images the excitonic wave function in reciprocal space, revealing the distribution of electrons within excitons. The experimental results confirm the inverted energy-momentum dispersion relationship of the photoemitted electron, consistent with theoretical predictions.
Article
Optics
D. A. Safronenkov, N. A. Borshchevskaya, T. Novikova, K. G. Katamadze, K. A. Kuznetsov, G. Kh Kitaeva
Summary: An experimental scheme and data processing approaches were proposed for measuring the normalized second-order correlation function of the biphoton field generated under spontaneous parametric down-conversion. Methods of discrimination of analog detection samples were developed to eliminate detection noises and obtain quantitatively true values of both the correlation function and the detector quantum efficiency. The methods were demonstrated depending on the type of detectors used in the SPDC channels.
Review
Physics, Multidisciplinary
Matteo Carlesso, Sandro Donadi, Luca Ferialdi, Mauro Paternostro, Hendrik Ulbricht, Angelo Bassi
Summary: This review discusses constraints on collapse models in quantum mechanics from non-interferometric experiments. Technological advances have allowed for a variety of experiments, including cold atoms, optomechanical systems, X-ray detection, bulk heating, and comparisons with cosmological observations, to challenge collapse models and test the validity of quantum mechanics.
Article
Engineering, Electrical & Electronic
Jason Merlo, Eric Klinefelter, Jeffrey A. Nanzer
Summary: This work presents a method for directly measuring target velocity in three dimensions using a dual axis correlation interferometric radar, achieving total velocity root-mean-square errors (RMSEs) of 41.01 mm.s(-1) and 45.07 mm.s(-1) for different target movements. By utilizing multiple orthogonal baselines and conventional Doppler velocity methods, a full 3-D velocity vector can be obtained with only three receive antennas and a single transmitter, without the need for tracking.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Engineering, Marine
Hanbin Gu, Xiaoan Zhu, Rui Shan, Jun Zang, Ling Qian, Pengzhi Lin
Summary: This paper briefly introduces a GNSS wave buoy that can monitor wave data by measuring vertical, north-south, and west-east displacements and velocities. The paper compares the results of the GNSS buoy with a Waverider deployed in close proximity, showing that the GNSS buoy provides similar wave information with slightly larger wave heights and shorter wave periods.
Article
Optics
Junnosuke Takai, Kosuke Shibata, Naota Sekiguchi, Takuya Hirano
Summary: We demonstrate the measurement of quadratic ac Stark shifts between Zeeman sublevels in an 87Rb Bose-Einstein condensate using a multistate atomic interferometer. The interferometer is able to detect the quadratic shift without being affected by relatively large state-independent shifts, thus improving the measurement precision. We measured the quadratic shifts in the total spin F = 2 state due to the light being near resonant to the D1 line. The agreement between the measured and theoretical detuning dependences of the quadratic shifts confirms the validity of the measurement. We also present results on the suppression of nonlinear spin evolution using near-resonant dual-color light pulses with opposite quadratic shifts.
Article
Engineering, Electrical & Electronic
Jason Merlo, Eric Klinefelter, Stavros Vakalis, Jeffrey A. Nanzer
Summary: A novel technique using multi-baseline millimeter-wave interferometric radar is presented for directly estimating the angular velocities of multiple targets to reduce nonlinear signal distortion. The technique shows promise in mitigating intermodulation distortion and recovering accurate angular velocity measurements in the presence of multiple targets.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Environmental Sciences
Haoyan Tang, Yunhua Wang, Chaofang Zhao, Daozhong Sun, Ge Chen, Hanwei Sun
Summary: This paper focuses on the study of coupling attitude altimetric error and its related position-shifting in interferometric radar altimeter (IRA). The theoretical formulas of the coupling attitude altimetric error are derived and theoretical analysis demonstrates that this error no longer follows the range direction strictly due to the change of radar beam pointing. The simulated results using attitude data from airborne experiments are consistent with the measurements.
Article
Optics
Xin-Yu Zhang, Hai-Jun Wu, Bing-Shi Yu, Carmelo Rosales-Guzman, Zhi-Han Zhu, Xiao-Peng Hu, Bao-Sen Shi, Shi-Ning Zhu
Summary: This article introduces a novel interferometric technique based on structured nonlinear optics, which is capable of superresolution measurement in real time. By cascading upconversion of a structured beam, the superresolved phase evolution of a multiphoton amplitude can be mimicked. Experimental results show that real-time monitoring using bright sensing beams and OAM mode projection can observe a up to a 12-photon de Broglie wavelength with almost perfect visibility. This result opens the door to real-time superresolution interferometric metrology and provides a promising way toward multiphoton superiority in practical applications.
LASER & PHOTONICS REVIEWS
(2023)
Review
Engineering, Mechanical
Dongxu Wu, Fengzhou Fang
Summary: Optical interferometry is a powerful tool in precision manufacturing for measuring and characterizing areal surface topography, but existing techniques are insufficient to meet the increasing demands for accuracy, speed, robustness, and dynamic range. This paper provides an in-depth perspective on surface topography reconstruction for optical interferometric measurements, presenting principles, configurations and applications of typical optical interferometers, as well as summarizing recent advances in fringe analysis algorithms. New developments in measurement accuracy, noise resistance, self-calibration ability, and computational efficiency are discussed, along with the challenges facing optical interferometry techniques in surface topography measurement and proposed solutions using advanced techniques.
FRONTIERS OF MECHANICAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Weike Feng, Jean-Michel Friedt, Pengcheng Wan
Summary: In this article, general software-defined radio hardware is used for ground-based interferometric radar system development to achieve static target imaging and displacement estimation. The proposed system synchronization approach, frequency-domain bandwidth synthesis method, and data preprocessing techniques have successfully improved range resolution and enhanced target image quality. Various experiments demonstrate the high-resolution target image and accurate displacement measurement capabilities of the developed SDR-GBIR systems.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Environmental Sciences
Chunyong Ma, Lichao Pan, Zhiwei Qiu, Da Liang, Ge Chen, Fangjie Yu, Hanwei Sun, Daozhong Sun, Weifeng Wu
Summary: In this paper, an airborne observation experiment was conducted in Rizhao, China to evaluate the inversion accuracy of ocean wave parameters (OWPs) using a dual-band interferometric imaging radar altimeter (DInIRA). The results showed that the inversion accuracy of significant wave height (SWH) and main wave wavelength (MWW) in the Ka band was better than that in the Ku band.
Article
Environmental Sciences
Jialiang Chen, Qinghua Yu, Ben Ge, Chuang Zhang, Yan He, Shengli Sun
Summary: This study explores the effect of the phase of the complex coherence factor on the interference fringes in interferometric imaging technology and proposes a method for measuring the phase difference of two interference signals. The method does not require the calibration of the optical path difference and can be applied to integrated optical interferometric imagers with single-mode fiber. The theoretical phase measurement accuracy of this method is higher than 0.05 p, meeting the requirements for image reconstruction.
Article
Physics, Applied
Andrew M. J. Edwards, Jack Cater, Joseph J. Kilbride, Pierre Le Minter, Carl V. Brown, David J. Fairhurst, Fouzia F. Ouali
Summary: This study introduces a new interferometric technique for precise measurements of droplet evaporation rates, revealing that the evaporation rate is highly dependent on the position of the droplet within the array and its confinement. The results are in good quantitative agreement with a recent analytical model of cooperative evaporation rates.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Vindhiya Prakash, Aleksandra Sierant, Morgan W. Mitchell
Summary: The technique described in the passage measures photon pair joint spectra by detecting the interference of nondegenerate photon pairs at a beam splitter. It is used to study photon-photon interactions and is well suited for characterizing pairs of photons, achieving successful implementation of correlated effects in experiments.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Wei Du, Jia Kong, Guzhi Bao, Peiyu Yang, Jun Jia, Sheng Ming, Chun-Hua Yuan, J. F. Chen, Z. Y. Ou, Morgan W. Mitchell, Weiping Zhang
Summary: The paper presents a new interferometer topology that nests a SU(2) interferometer inside a SU(1,1) interferometer. This new interferometer achieves high signal-to-noise ratio, sensitivity beyond the standard quantum limit, and tolerance to photon losses. Experimental results demonstrate its effectiveness in addressing the issue of photon losses in interferometers.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
C. Troullinou, R. Jimenez-Martinez, J. Kong, V. G. Lucivero, M. W. Mitchell
Summary: The study examines the impact of optical polarization squeezing on the performance of an optically pumped magnetometer, demonstrating that probe polarization squeezing improves high-frequency sensitivity and increases measurement bandwidth while avoiding measurement backaction noise. The research provides a model for the dynamics of quantum noise in the magnetometer, showing how polarization squeezing reduces optical noise and shunts measurement backaction into the unmeasured spin component.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Silvana Palacios Alvarez, Pau Gomez, Simon Coop, Roberto Zamora-Zamora, Chiara Mazzinghi, Morgan W. Mitchell
Summary: We present a magnetic sensor with extremely high energy resolution, applied in the detection of Rb-87 single-domain spinor Bose-Einstein condensates. By utilizing nondestructive Faraday rotation probing, we have achieved a low-frequency magnetic sensitivity of 72(8) fT, and measured the volume, spin coherence time, and readout noise of the condensate experimentally.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Optics
Vito G. Lucivero, Andrea Zanoni, Giacomo Corrielli, Roberto Osellame, Morgan W. Mitchell
Summary: The article discusses the fabrication of alkali-metal vapor cells using femtosecond laser machining. This technology allows for the creation of arbitrarily-shaped 3D interior volumes, integration with photonic structures, and the production of cells with sub-atmospheric buffer gas pressures without vacuum apparatus. The LWVC technology shows potential for applications in miniaturized atomic quantum sensors and frequency references.
Article
Physics, Applied
V. G. Lucivero, W. Lee, T. W. Kornack, M. E. Limes, E. L. Foley, M. V. Romalis
Summary: The magnetic gradiometer described in the study operates at finite fields, utilizing a pulsed laser to polarize an atomic ensemble and a compact laser probe to detect paramagnetic Faraday rotation. It demonstrates high sensitivity and common-mode rejection ratio.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Michael C. D. Tayler, Kostas Mouloudakis, Rasmus Zetter, Dominic Hunter, Vito G. Lucivero, Sven Bodenstedt, Lauri Parkkonen, Morgan W. Mitchell
Summary: Atomic spin sensors, with their compact microfabricated packages, show great potential for precision measurements. This study focuses on enhancing the performance of these sensors through magnetic field control using miniature coils. The results demonstrate the effectiveness of the coils in laboratory-scale magnetometers and magnetoencephalography applications.
PHYSICAL REVIEW APPLIED
(2022)
Article
Environmental Sciences
Gorka Munoz-Gil, Alexandre Dauphin, Federica A. Beduini, Alejandro Sanchez de Miguel
Summary: The study proposes using crowdsourced photos as an alternative data source to analyze the color of artificial lights at night. The method proves to be effective in classifying streetlights according to their color and offers complementary information compared to current data sources.
Article
Optics
K. Mouloudakis, G. Vasilakis, V. G. Lucivero, J. Kong, I. K. Kominis, M. W. Mitchell
Summary: This study presents a first-principles analysis of the noise spectra of alkali-metal vapors in and out of the spin-exchange-relaxation-free (SERF) regime. The study predicts nonintuitive features that have the potential to improve the sensitivity of SERF media, and highlights their importance in quantum optical applications.
Article
Physics, Multidisciplinary
Lorena C. Bianchet, Natalia Alves, Laura Zarraoa, Tomas Lamich, Vindhiya Prakash, Morgan W. Mitchell
Summary: In this study, we present precise subwavelength optical intensity measurements using a single trapped 87Rb atom as a sensor. The intensity is measured by the scalar ac Stark shift it produces on the hyperfine transition of the D2 line. We demonstrate the method by measuring the intensity at the focus of an optical tweezer.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Sven Bodenstedt, Morgan W. Mitchell, Michael C. D. Tayler
Summary: This study discusses procedures for error-tolerant spin control in environments that allow transient, large-angle reorientation of a magnetic bias field. By using short sequences of nonresonant magnetic-field pulses in a laboratory-frame meridional plane, robust z inversion in proton (H-1) nuclear magnetic resonance near Earth's field is demonstrated.
Article
Optics
D. Goncalves, M. W. Mitchell, D. E. Chang
Summary: This approach aims to engineer photon correlations by utilizing separate pump and probe beams to increase atomic emission and balance it with the probe, effectively overcoming inefficient atom-light coupling. By tuning the pump amplitude, the correlation function g((2))(0) can be adjusted from zero (perfect antibunching) to infinite (extreme bunching), showing that the physically unchanged coupling efficiency can be enhanced through the addition of the pump beam.
Article
Optics
Safoura S. Mirkhalaf, Daniel Benedicto Orenes, Morgan W. Mitchell, Emilia Witkowska
Summary: The study shows that the estimation of the control parameter in a ferromagnetic Bose-Einstein condensate exhibits the same scaling beyond the standard quantum limit near critical points and away from critical points. Depletion of the m(f) = 0 Zeeman sublevel and transverse magnetization are identified as signals capable of saturating sensitivity scaling. The results suggest the feasibility of sub-standard quantum limit sensing in ferromagnetic condensates with current experimental capabilities.
