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Trapped ions are a key experimental platform for quantum computing, while photons transport information over long distances. Optical cavities provide a coherent link between these two systems, as demonstrated by recent experiments with calcium ions.
The nitrogen-vacancy center in diamond is a promising candidate to realize quantum networks. We create multi-qubit nodes of nuclear spins in the environment and couple these nodes together by entangling remote nitrogen-vacancy centers through photons.
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.
A simple and robust technique to extract the complex optical conductivity of truly two-dimensional materials is developed. Applying the method to chemical-vapor-deposited graphene, we extract the complex conductivity, including Fermi level and scattering time.
We present a spectrogram-based timing technique for x-ray free electron lasers (XFELs) that reports x-ray/optical delay below 1 fs RMS error to correct for timing jitter.
We demonstrate for the first time the feasibility of a 32×32 MZI-SOA hybrid switch by means of a re-circulating loop. A power penalty of less than 2.9dB at a data rate of 10Gb/s is obtained.
We experimentally investigate the sampling phase dependence of baud-rate sampled and equalized coherent receiver for Nyquist Pulse-shaped high-order QAM signals on the modulation format and roll-off factors.
We demonstrate an entanglement mapping based characterisation protocol for coupled-qubit Hamiltonians. This is achieved by generating and measuring time-evolved states relevant to an NV-diamond system, using a reconfigurable integrated optical device.
We present closed-loop adaptive phase compensation of a 1.3 kW solid-state slab laser system. Experimental results demonstrated the beam quality is greatly improved with the proposed adaptive optics system.
A frequency-resolved optical gating (FROG) that simultaneously acquires two secondharmonic-generation FROG traces and a cross-correlation FROG trace is reported. This FROG allows robust and reliable characterization of two unknown pulses.
We have developed a nonlinear spectral unmixing algorithm that separates fluorescence excitation-emission matrix of multiple fluorophores affected by the inner filter effect. We evaluate this technique on simulated data and demonstrate its superior performance experimentally for a mixture of fluorophores.
We report on a spin-based surface plasmon directional excitation by spinoptical Rashba metasurfaces. The light-matter interaction control via the geometric design of the metasurface symmetry ushers in a new era of light manipulation.
By employing low dark count up-conversion single photon detectors, we have experimentally demonstrated the passive decoy-state method over a 50-km-long optical fiber and have obtained a key rate of about 100 bit/s.
We present a simple design of a quantum repeater design build from single NV- centers embedded in an optical cavity. We compare different quantum networks from a simple linear chain to a fully fault-tolerant quantum internet.
We present a novel method of spatiotemporal optical coherence (STOC) manipulation, in which the effective coherence properties of the optical field are adjusted by modulating the phase of the spectral degree of coherence.
A 1 Gbps 105.4 GHz wireless link is demonstrated by directly modulating a photonic integrated dual-laser source. A 50 m link is predicted to be able to achieve error free operation using FEC following optimisation.
We describe a simulation approach for studying quantum-mechanical noise in large-scale nonlinear optical circuits. We apply this model to predict the behavior of a 4-bit counter circuit containing several hundred optical components.
We develop techniques to verify the computational complexity of a class of analogue quantum computers known as boson samplers. We demonstrate these techniques with up to 5 photons in two different types of integrated linear optical circuit, observing Hilbert spaces of up to 50,000 dimensions.
We demonstrate a synthetic-wavelength interferometry system on a silicon photonic chip, comprising an interferometer with tunable power splitting ratio and photodetectors. The system enables distance measurements with errors below 5 µm and acquisition times of 14 µs.
A novel wideband radio frequency phase stabilized downlink transmission and optical domain down-conversion scheme is proposed. The achieved stability of the intermediate frequency is ∼1.8×10−12τ−1/2 after transferring through 30km optical fiber.
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