Ground-layer adaptiveoptics(GLAO)has shown its potential for use in solar observation owing to its wide field-of-view(FOV)correction.A high-order GLAO system that consists of a multiple direction Shack-Hartmann wavef...
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Ground-layer adaptiveoptics(GLAO)has shown its potential for use in solar observation owing to its wide field-of-view(FOV)correction.A high-order GLAO system that consists of a multiple direction Shack-Hartmann wavefront sensor(WFS),a realtime controller with a multi-CPU processor,and a 151-element deformable mirror was developed for the 1-m New Vacuum Solar Telescope at Yunnan Observatories,Chinese Academy of Sciences.A hexagonal microlens with 9×8 subapertures is employed in the *** detection FOV is 42′′×37′′,in which 9(3×3)guide regions are extracted for multiple direction wavefront sensing with a frame rate of up to 2200 *** our knowledge,this is the first professional solar GLAO system used as a regularly operating instrument for scientific *** installation and adjustment were performed in the summer of *** this article,a detailed account of the GLAO system and its first light results and a comprehensive analysis of the performance of the GLAO system are *** results show that this system can effectively improve the imaging quality after compensating for the wavefront aberration due to ground-layer turbulence.
Since the concept of adaptiveoptics(AO)was proposed in 1953,AO has becomean indispensable technology for large aperture ground-based optical telescopes aimedat high resolution *** paper provides a comprehensive revie...
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Since the concept of adaptiveoptics(AO)was proposed in 1953,AO has becomean indispensable technology for large aperture ground-based optical telescopes aimedat high resolution *** paper provides a comprehensive review of AOprogress for large aperture astronomical optical telescopes including both night-timeand day-time solar optical *** recent AO technological advances,suchas Laser Guide Star,Deformable Secondary Mirror,Extreme AO,and Multi-ConjugateAO are focused.
Quantum key distribution with different frequency codes is demonstrated with a reconfigurable entanglement distribution network,which is essential for scalable and resource-efficient quantum communications.
Quantum key distribution with different frequency codes is demonstrated with a reconfigurable entanglement distribution network,which is essential for scalable and resource-efficient quantum communications.
Virtual Shack-Hartmann wavefront sensing(vSHWS)has some significant advantages and is promising for aberration measurement in the field of biomedical optical *** illumination sources used in vSHWS are almost broadband...
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Virtual Shack-Hartmann wavefront sensing(vSHWS)has some significant advantages and is promising for aberration measurement in the field of biomedical optical *** illumination sources used in vSHWS are almost broadband,but are treated as monochromatic sources(only using center wavelength)in current data processing,which may cause *** work proposed a data processing method to take into account the multiple wavelengths of the broadband spectrum,named multiple-wavelength centroid-weighting *** feasibility was demonstrated through a series of simulations.A wavefront generated with a set of statistical human ocular aberrations was used as the target wavefront to evaluate the performance of the proposed and current *** results showed that their performance was very close when used for the symmetrical,but the wavefront error of the proposed method was much smaller than that of the current method when used for the asymmetrical spectrum,especially for the broader *** results were also validated by using 20 sets of clinical human ocular aberrations including normal and diseased *** proposed method and the obtained conclusions have important implications for the application of vSHWS.
The detection of gravitational waves has ushered in a new era of observing the *** resource advantages offer significant enhancements to the sensitivity of gravitational wave *** squeezed states for ground-based gravi...
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The detection of gravitational waves has ushered in a new era of observing the *** resource advantages offer significant enhancements to the sensitivity of gravitational wave *** squeezed states for ground-based gravitational wave detection have received marked attention,the generation of squeezed states suitable for mid-to-low-frequency detection has remained *** address the gap in squeezed state optical fields at ultra-low frequencies,we report on the first direct observation of a squeezed vacuum field until Fourier frequency of 4 millihertz with the quantum noise reduction of up to 8.0 dB,by the employment of a multiple noise suppression *** work provides quantum resources for future gravitational wave observatories,facilitating the development of quantum precision measurement.
We report a compact experimental setup for producing a quantum degenerate mixture of Bose23Na and Fermi40K gases. The atoms are collected in dual dark magneto–optical traps(MOT) with species timesharing loading to re...
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We report a compact experimental setup for producing a quantum degenerate mixture of Bose23Na and Fermi40K gases. The atoms are collected in dual dark magneto–optical traps(MOT) with species timesharing loading to reduce the light-induced loss, and then further cooled using the gray molasses technique on the D2line for23Na and D1line for40K. The microwave evaporation cooling is used to cool23Na in |F = 2, mF= 2〉 in an optically plugged magnetic trap, meanwhile,40K in |F = 9/2, mF= 9/2〉 is sympathetically cooled. Then the mixture is loaded into a large volume optical dipole trap where23Na atoms are immediately transferred to |1, 1〉 for further effective cooling to avoid the strong three-body loss between23Na atoms in |2, 2〉 and40K atoms in |9/2, 9/2〉. At the end of the evaporation in optical trap, a degenerate Fermi gas of40K with 1.9 × 10^(5) atoms at T/TF= 0.5 in the |9/2, 9/2〉 hyperfine state coexists with a Bose–Einstein condensate(BEC) of23Na with 8 × 10^(4) atoms in the |1, 1〉 hyperfine state at 300 n K. We also can produce the two species mixture with the tunable population imbalance by adjusting the 23Na magneto–optical trap loading time.
To address the challenges of piston error detection in segmented mirror systems under noisy environments, this paper proposes a wavelet-driven deep multichannel feature extraction method (WTCNN). To the best of our kn...
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Quantum states are essential resource for quantum-enhanced *** incurred in the distribution channel,however,dissipates the high signal-to-noise ratio advantage enjoyed by the squeezed ***,we first demonstrate noise im...
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Quantum states are essential resource for quantum-enhanced *** incurred in the distribution channel,however,dissipates the high signal-to-noise ratio advantage enjoyed by the squeezed ***,we first demonstrate noise immunity enhancement by using phase-sensitive amplifier(PSA)with measurement-based noiseless linear amplifier(MB-NLA).We explore the signal transfer capability with the amplifier in a noisy *** MB-NLA enhanced PSA has obvious suppression effect on channel noises,especially it has improvement for the noise contaminated *** performance can be achieved by flexibly adjusting amplifier *** the amplifier,it is promising to overcome the entanglement-distribution loss and show its superiority in squeezing based quantum sensing.
Quantum teleportation has been developed to simultaneously realize the Hertz rate and the 64-km distance through fiber channels,which is essential to real-world application of quantum network.
Quantum teleportation has been developed to simultaneously realize the Hertz rate and the 64-km distance through fiber channels,which is essential to real-world application of quantum network.
A single-photon source with narrow bandwidth,high purity,and large brightness can efficiently interact with material qubits strongly coupled to an optical microcavity for quantum information ***,we experimentally demo...
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A single-photon source with narrow bandwidth,high purity,and large brightness can efficiently interact with material qubits strongly coupled to an optical microcavity for quantum information ***,we experimentally demonstrate a degenerate doubly resonant single-photon source at 852 nm by the cavity-enhanced spontaneous parametric downconversion process with a 100%duty cycle of *** single photon source possesses both high purity with a second-order correlation g^((2))_(h)(0)=0.021 and narrow linewidth with△_(V_(sp))=(800±13)*** single-photon s Single-photon source with sub-MHz linewidth for cesium-based quantum information processingource is compatible with the cesium atom D2 line and can be used for cesium-based quantum information processing Single-photon source with sub-MHz linewidth for cesium-based quantum information processing0.021.
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