Wide-field SU(1,1) interferometer - Frascella, Gaetano; Mikhailov, E. E.; Takanashi, N.; Zakharov, R. V.; Tikhonova, O. V.; Chekhova, Maria (Optica, 2019)
An SU(1,1) interferometer uses a sequence of two optical parametric amplifiers for achieving sub-shot-noise sensitivity to a phase shift introduced in between. We present the first realization of a wide-field SU(1,1) interferometer, where the use of a focusing element enables spatially multimode operation within a broad angle. Over this angle, the interference phase is found to be flat. This property is important for the high sensitivity to the phase front disturbance. Further, -4.3 +/- 0.7 dB quadrature squeezing, an essential requirement to the high sensitivity, is experimentally demonstrated for plane-wave modes inside the interferometer. Such an interferometer is useful not only for quantum metrology, but also in remote sensing, enhanced sub-shot-noise imaging, and quantum information processing. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
CRIS-Team WoS Importer:2019-10-11

Witnessing quantum squeezing with binary Homodyne detection - Müller, Christian R.; Seshadreesan, Kaushik P.; Peuntinger, Christian; Leuchs, Gerd; Marquardt, Christoph (Optics InfoBase Conference Papers, 2017)
CRIS-Team Scopus Importer:2022-06-05

Young's Double-Slit, Invisible Objects and the Role of Noise in an Optical Epsilon-near-Zero Experiment - Ploss, Daniel; Kriesch, Arian; Etrich, Christoph; Engheta, Nader; Peschel, Ulf (ACS Photonics, 2017)
Epsilon-near-zero (ENZ) media disclose the peculiarities of electrodynamics in the limit of infinite wavelength but nonzero frequency for experiments and applications. Theory suggests that wave interaction with obstacles and disturbances dramatically changes in this domain. To investigate the optics of those effects, we fabricated a nanostructured 2D optical ENZ multilayer waveguide that is probed with wavelength-tuned laser light via a nanoscale wave launch configuration. In this experimental framework, we directly optically measure wave propagation and diffraction in a realistic system with the level and scale of imperfection that is typical in nanooptics. As we scan the wavelength from 1.0 to 1.7 μm, we approach the ENZ regime and observe the interference pattern of a microscale Young's double slit to steeply diverge. By evaluating multiple diffraction orders we experimentally determine the effective refractive index neff and its zero-crossing as an intrinsic measured reference, which is in agreement with theoretical predictions. We further verify that the double-slit and specifically placed scattering objects become gradually invisible when approaching the ENZ regime. We also observe that light-matter interaction intensifies toward ENZ and quantify how speckle noise, caused by tiny random imperfections, increasingly dominates the optical response and blue-shifts the cutoff frequency.
CRIS-Team Scopus Importer:2023-04-20
Keywords: diffraction; double-slit; ENZ; epsilon-near-zero; noise; photonics

Broadband Sheet Parametric Oscillator for chi ((2)) Optical Frequency Comb Generation via Cavity Phase Matching - Ni, Xin; Jia, Kunpeng; Wang, Xiaohan; Liu, Huaying; Guo, Jian; Huang, Shu-Wei; Yao, Baicheng; Sernicola, Nicolo; Wang, Zhenlin; Lv, Xinjie; Zhao, Gang; Xie, Zhenda; et al. (Chinese Physics Letters, 2021)
We demonstrate a broadband optical parametric oscillation, using a sheet cavity, via cavity phase-matching. A 21.2 THz broad comb-like spectrum is achieved, with a uniform line spacing of 133.0 GHz, despite a relatively large dispersion of 275.4 fs(2)/mm around 1064 nm. With 22.6% high slope efficiency, and 14.9 kW peak power handling, this sheet optical parametric oscillator can be further developed for chi ((2)) comb.
CRIS-Team WoS Importer:2021-07-09

Extracting unambiguous information from a single qubit by sequential observers - Fields, Dov; Han, Rui; Hillery, Mark; Bergou, Janos A. (Physical Review A, 2020)
In a recent paper [Phys. Rev. Lett. 111, 100501 (2013)], a scheme was proposed where subsequent observers can extract unambiguous information about the initial state of a qubit, with finite joint probability of success. Here, we generalize the problem for arbitrary preparation probabilities (arbitrary priors). We discuss two different schemes: one where only the joint probability of success is maximized and another where, in addition, the joint probability of failure is also minimized. We also derive the mutual information for these schemes and show that there are some parameter regions for the scheme without minimizing the joint failure probability where, even though the joint success probability is maximum, no information is actually transmitted by Alice.
CRIS-Team WoS Importer:2020-02-04

Reflections about the holographic and non-holographic acquisition of surface topography: where are the limits? - Häusler, Gerd; Willomitzer, Florian (Light: Advanced Manufacturing, 2022)
Recording and (computational) processing of complex wave fields offer a vast realm of new methods for optical 3D metrology. We discuss fundamental similarities and differences between holographic surface topography measurement and non-holographic principles, such as triangulation, classical interferometry, rough surface interferometry and slope measuring methods. Key features are the physical origin of the ultimate uncertainty limit and how the topographic information is encoded and decoded. Besides the theoretical insight, the discussion will help optical metrologists to determine if their measurement results could be improved or have already hit the ultimate limit of what physics allows.
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Keywords: Holography; Optical metrology; Physical limits; Topography