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We present tapered diamond nano beams, which allows efficient collection of diamond nitrogen vacancy emission through phase-matched coupling to a tapered optical fiber.
We experimentally demonstrate Anderson localization for optical pulses in time domain, using a photonic mesh lattice implemented with coupled optical fiber loops. We also discuss interplay of photonic band-gaps and disorder in such lattices.
Industrial technologies based on the production, manipulation, and detection of single and entangled photons are emerging, and quantum key distribution via optical fibre is one of the most commercially-advanced. The National Physical Laboratory is developing traceable performance metrology for the quantum devices used in these technologies. This is part of a broader effort to develop metrological...
Here we introduce two works on quantum plasmonics: high-visibility on-chip quantum interference of single surface plasmons and transmission of quantum polarization entanglement in a nanoscale hybrid plasmonic waveguide. Our works can bridge nanophotonics and quantum optics.
Saturable absorption has been discovered in two-dimensional nanomaterial tungsten disulfide (WS2) near 1550nm. The mode-locked laser based on WS2 saturable absorber have been demonstrated, which indicates the potential of WS2 for ultrafast photonic applications.
We report the development of nanodiamond-doped tellurite fibers with both preserved single photon emission properties of the nanodiamonds embedded in the glass and fiber loss reduced to levels suitable for practical applications.
Astrophotonics — the interface of photonics and astronomical instrumentation — has already made important contributions to ground-based and space-based instrumentation (space photonics). The early developments built on technologies arising out of telecommunications but, in recent years, astrophotonics has begun to “give back” to traditional photonic fields. The main goals of astrophotonics are to...
Mid-infrared (3.39 μm) optical modulators are demonstrated for the first time on the silicon-on-lithium-niobate platform, with a Vπ·L of 26 V·cm, extinction ratio of 8 dB, and on-chip insertion losses of 3.3 dB.
Gas-filled hollow-core photonic crystal fibers are used to stabilize a fiber laser to the 13C2H2 P(16) (V1 + V3) transition at 1542 nm using saturated absorption. The fiber is encapsulated in glass cells for gas handling and compact free-space coupling, and packaged in a easy-to-use configuration. The system is showing a locking-point repeatability within 60 kHz with respect to a conventional acetylene...
In this work we experimentally demonstrate a fully integrated photon-counting device based on a divide-and-conquer technique using linear optics in combination with on-off detectors. Our scheme is based on click-counting statistics instead of photon-counting statistics.
We demonstrate high optical depths of > 50 lasting over 100 minutes in a Rubidium filled PBGF using an off-resonant CW laser beam, which enables straightforward measurement of cross-phase modulation at the single photon level.
The joint spectra of the two type-II phase-matchings that add coherently to give rise to the generation of polarization-entangled photon pairs in a poled fiber are measured. Optimal parameters are identified for the generation of high-quality entanglement.
We realize an ultra-fast source of telecom single photons heralded at MHz-rates by combining a 10-GHz repetition-rate laser with off-the-shelf fiber components and waveguide nonlinear stages. Measured 2nd-order autocorrelation functions are the lowest reported to date.
We present an experimental setup for studying strongly nonlinear light-matter interactions using cold atoms inside a hollow core fiber. A Rydberg EIT process can potentially be used to generate strong and tunable effective photon-photon interactions.
Cascaded four-wave-mixing was effectively demonstrated in a graphene-coated-microfiber, by using a pulsed pump at 1550 nm, which may be useful for realization of graphene based fiber-optic nonlinear devices, e.g. lasers, filters, modulators and regenerators.
We demonstrate the efficient coupling of a diamond micro-waveguide containing a single nitrogen-vacancy center to a single mode optical fiber. Strong photon anti-bunching is observed with a raw single-photon count rate exceeding 712,000 Hz.
We experimentally demonstrate quantum key distribution at 28 bit/s rate in a telecommunications fiber channel with 45 dB loss using a subcarrier wave approach. This approach offers polarization independency, high bitrates and wide multiplexing capabilities.
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