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Entanglement plays a central role in fundamental tests of quantum mechanics as well as in the burgeoning field of quantum information processing. Particularly in the context of quantum networks and communication, an outstanding challenge is the efficient generation of entanglement between stationary (spin) and flying (photon) qubits. In this talk, I will first show the observation of quantum entanglement...
We observe an effective magnetic field for photons using an on-chip silicon-based Ramsey-type interferometer. This interferometer generates a direction-dependent phase which corresponds to a magnetic field of 0.2 Gauss in an Aharonov-Bohm configuration for electrons.
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.
The optical low-coherence interferometry built with an optical ruler was proposed to demonstrate silicon-wire transverse-magnetic polarized indices of refraction and birefringence as 2.02 and 0.64, respectively, from the microring resonator effective length using various interferograms.
We report photonic radio-frequency arbitrary waveform generation in the W-band, enabled through optical pulse shaping and a near-ballistic uni-traveling-carrier photodiode. Example waveforms spanning 75–110GHz with long time apertures are generated and measured after wireless propagation.
We report an interferometer consisting of two spatially separated balanced Mach-Zehnder interferometers sharing a polarization entangled source. Nonlocal correlation statistics enable entanglement detection, Bell state identification, and fidelity bounding.
We present an Er-doped fiber femtosecond laser having a wider repetition rate tuning range by introducing a pair of CFBGs which magnifies the cavity length change by 15 times.
We report carrier-envelope offset beat detection (52-dB signal-to-noise ratio at 100-kHz resolution bandwidth) with a common-path 2f-to-3f self-referencing interferometer with a dual-pitch periodically poled lithium niobate ridge waveguide.
We present SBS suppression in a single frequency amplifier using frequency sidebands added by an EOM and complete recovery of the single frequency signal after amplification using a custom high power high modulation index EOM.
We present graphene-based optical modulators integrated with Si3N4 waveguides which provide broadband flat absorption from visible to infrared wavelengths. Tunable attenuation of 0.067 dB/µm is measured in Mach-Zehnder interferometers and microring resonators.
Principles of asynchronous optical parametric oscillator frequency combs are introduced and their performance in dual-comb mid-infrared molecular spectroscopy is presented, including a specific demonstration of methane absorption spectroscopy with a resolution of 0.2 cm−1.
A novel intensity modulator for pulsed light is proposed and demonstrated here for the first time. This has been realized by introducing an injection-locked AlGaInAs mode-locked laser into one arm of a Mach-Zehnder interferometer.
We study multi-shot intensity-and-phase measurements of unstable trains of ultrashort pulses using two-dimensional spectral shearing interferometry (2DSI) and self-referenced spectral interferometry (SRSI) in order to identify warning signs of pulse-shape instability.
We demonstrated the generation of ultra-broadband optical pulses with axially-symmetric polarization, on the basis of a coherent beam combining technique. The high polarization purity (∼95 %) ranging from 750 to 880 nm was obtained.
We demonstrate two high-dimensional QKD protocols — secure against collective Gaussian attacks — yielding up to 8.6 secure bits per photon and 6.7 Mb/s throughput, with 6.9 bits per photon after transmission through 20 km of fiber.
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 verified interferometrically generation of spatially pure photon pairs via spontaneous parametric down-conversion in a multimode nonlinear waveguide in the 800 nm spectral region, obtaining two-photon interference visibility robustly exceeding 90% without any spatial filtering.
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.
We report on a record 800 nm-to-terahertz energy conversion efficiency of 0.13% at room temperature in LiNbO3 by tilting the pulse intensity front and experimentally studying optimal pumping conditions.
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