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Single-photon W-states — coherent superpositions of all qubits with equal probability amplitudes — involving up to 16 spatial modes are generated by means of evanescently-coupled waveguide technology. A scheme capable of exploiting the maximal entanglement of W-states is proposed for the efficient generation of random numbers.
Diffraction-limited imaging in a variety of complex media is realized based on analysis of speckle correlations in light captured using a camera phone.
Femtosecond transient absorption spectroscopy measurements indicate that the dominant relaxation pathway for excited states in perovskite materials is by recombination of free electrons and holes.
A pulsed laser technique that induces mechanical stress in cells offers high-throughput testing of the effect of molecular agents on mechanotransduction in cells.
Trapping of a terahertz wave in a photonic-crystal slab and subsequent ‘capture’ through absorption are demonstrated. Over 90% of the wave lying within 17% of the centre frequency is absorbed. Application to the stabilization of terahertz wireless communication systems is shown.
Scalable methods employing a random unitary chip and a quantum walk chip are developed to experimentally verify correct operation for large-scale boson sampling. Experimental analysis reveals that the resulting statistics of the output of a linear interferometer fed by indistinguishable single-photon states exhibits true non-classical characteristics.
A high-resolution, broadband imaging system based on coherent anti-Stokes Raman spectroscopy performs rapid, chemically specific imaging of biological tissue. It employs three-colour excitation and operates across the entire biological window.
The phase of a collection of spins is measured with a sensitivity ten times beyond the limit set by the quantum noise of an unentangled ensemble of 87Rb atoms. A cavity-enhanced probe of an optical cycling transition is employed to mitigate back-action associated with state-changing transitions induced by the probe.
The vibrations of the chemical bonds of a single molecule are observed by employing time-resolved coherent anti-Stokes Raman scattering. A gold nanoantenna is used to enhance the signal from the molecule.
A suite of flexible, integrated, high-index-contrast chalcogenide glass photonic devices, including waveguides, microdisk resonators, add–drop filters and photonic crystals, is reported. The devices are demonstrated to survive repeated bending to a submillimetre radius without any significant degradation in their optical performance.
A photothermal imaging scheme that is analogous to optical coherence tomography can be used to construct the three-dimensional structures of bone and burn-affected skin.
Extreme-ultraviolet frequency combs have previously been used to realize spectroscopy with a megahertz level resolution, but higher resolutions are desired for precision-measurement applications. Now, a sub-hertz spectral resolution is demonstrated, which corresponds to coherence times of over 1 s at photon energies up to 20 eV; such coherence times are over six orders of magnitude longer than those previously reported.
Hybrid entanglement between a quantum single-photon qubit state and a classical one is experimentally generated by quantum-mechanically superposing non-Gaussian operations on distinct modes. Entanglement is clearly observed between the two different types of generated states. This method provides a feasible way to generate even larger hybrid entanglement.
Optical entanglement between a particle-like subsystem and a wave-like one is generated through the heralding detection of a single photon in an indistinguishable fashion at a central station. This enables information to be converted from one Hilbert space to the other via teleportation, and hence permits remote quantum processors based on different encodings to be connected.
A simple method is demonstrated for high-order harmonic generation with fully controlled (linear, elliptical and circular) polarization. Its conversion efficiency is comparable to those of conventional high-order harmonic methods. This technique potentially has a broad range of applications from ultrafast circular dichroism to attosecond quantum optics.
A cavity quantum electrodynamics system comprising a quantum emitter and an optical cavity is theoretically investigated. The outcoupling process for the N-photon state of the cavity is simulated. The numerical calculations predict the possibility of operating this system as a source of N-photon bundles with a tunable integer N.
Large-scale densely integrated optical memory on a single photonic crystal chip is demonstrated. The wavelength-division-multiplexing (WDM) capabilities of nanophotonic memories are exploited for optical addressing. This work may enable optical random-access memories and a large-scale WDM photonic network-on-chip.
Recent demonstrations of modulators, polarization rotators and isolators have indicated the potential of graphene for photonic applications. The present study investigates the fundamental limits and near-optimal design of graphene modulators and non-reciprocal devices.
