The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Repeatability of resonance detection for on-chip microring resonators is systematically studied. An efficient interferometric method is presented to improve the accuracy by more than one order of magnitude in an 8 nm bandwidth, without any temperature control.
We achieved a sub-fs thermal-noise-limited noise floor in a balanced optical-microwave phase detector and demonstrated long-term stable RF extraction with <1 fs RMS drift and <7 fs pk-pk for over 10 hours of continuous operation.
We demonstrate a novel comb tuning method for microresonator-based Kerr comb generators. Continuously tunable, low-noise, and coherent comb generation is achieved in a CMOS-compatible silicon nitride microring resonator.
Quantum random number generator statistics fluctuates with time due to noise affecting quality of randomness. We use Bayesian inference to monitor the statistics after each measurement and bin data adaptively to mitigate effects of noise.
We generated ultrabroadband coherent infrared pulses by focusing hollow-fiber compressed intense 10-fs pulses in air. We also coherently detected the electric-field profiles in the whole infrared range through the field-induced second harmonic generation in air.
We have experimentally performed continuous variable quantum key distribution over up to 50 km, in coexistence with a dense-wavelength-multiplexed channel of several dBms. This opens new perspectives for QKD integration over existing optical network architectures.
A low noise multi-carrier generation scheme using optical FIR filter for ASE noise suppressing is proposed. 50 and 69 low noise carriers are generated experimentally, having much higher carrier-to-noise-ratio values of 22.5dB and 19.1dB.
THz radiation was generated by mixing idler-idler waves from coupled optical parametric oscillators based on stacked KTP plates. Power enhancement, noise reduction, and linewidth narrowing have been attributed to noise reduction between idler waves.
We present a Rayleigh backscattering noise mitigation scheme for 10-Gb/s loop-back WDM-PON with cascaded SOAs. OSRNR is reduced to 16.5 dB and BER is improved by 6 dB with the incorporation of microwave photonic filter.
We report an experimental study of a new technique for spin cooling an ensemble of ultracold atoms via quantum non-demolition (QND) measurement and incoherent feedback. We have demonstrated 12db spin noise reduction. This technique has direct application in generating highly entangled macroscopic singlet states.
We show that the performance of continuous-variable measurement-device-independent quantum key distribution will decline dramatically when considering detector's imperfections. However, it can be improved by using phase sensitive optical amplifiers.
We report the work of exploring atom interferometry techniques to perform precision gravity measurements in our laboratory. The noise suppressions and related modulation experiments for the atom gravimeter will be presented in detail.
We provide a quantitative analysis of the coherence in microresonator frequency combs. We show how to achieve coherent transform-limited pulses on-chip without actively manipulating the pump setting conditions in the course of comb formation.
We demonstrate sub-shot-noise microcantilever displacement sensitivity using simple differential measurements with multi-spatial-mode squeezed light, a result that may be critical for ultra-trace sensing and imaging applications.
Recent progress in low-noise optical amplification and signal processing has raised prospects of practical devices operating below the conventional quantum limit. We review basic principles, practical implementation, and performance of such devices.
We investigate methods to modulate the photodiode responsivity for high-speed photodetection, i.e., parametric down-conversion. Electrical modulation is preferred over optical modulation and gives near optimum efficiency of ∼20%. Applications are near- and mid-infrared spectroscopy methods.
A technique of suppressing optical beat interference (OBI) noise in OFDMA PON is proposed and verified experimentally by applying RF clipping tone. We achieve reliable 8Gbit/s 20km uplink transmission with spectral efficiency 2.7bit/s/Hz.
We analyse frequency conversion by Bragg scattering numerically including Raman scattering. The frequency configuration that performs the best under influence of Raman noise results in 95% conversion over a 3.25 THz bandwidth with a 2.5-dB noise figure.
We demonstrate soliton fission induced by free-carriers for the first time. Using time-resolved near-field measurements, we directly observe the nonlinear pulse evolution along the 1.5 millimeter nanophotonic waveguide in-situ, a record short fission length.
We introduce a simple and efficient technique to verify quantum discord in unknown Gaussian states and certain class of non-Gaussian states. We show that any separation in the peaks of the marginal distributions of one subsystem conditioned on two different outcomes of homodyne measurements performed on the other subsystem indicates correlation between the corresponding quadratures and hence nonzero...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.