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Using a long-lived quantum-dot spin qubit coupled to a GaAs-based photonic crystal cavity, researchers demonstrate complete quantum control of an electron spin qubit. By cleverly controlling the charge state of the InAs quantum dot using laser pulses, optical initialization, control and readout of an electron spin are achieved.
Materials exhibiting three-dimensional (3D) linear dispersion relations between frequency and wavevector are expected to display a wide range of interesting phenomena. 3D linear point degeneracies between two bands (“Weyl points”) have yet to be observed. Based on analytical and numerical analysis, researchers predict Weyl point formation in 3D photonic crystals.
Scientists introduce an approach, time reversal of variance-encoded light (TROVE), that can demix spatial modes within an ultrasound focus inside scattering media, breaking the resolution barrier imposed by the ultrasound. Optical focusing and imaging with diffuse light at a speckle-scale lateral resolution of ∼5 µm is achieved.
The popular organic semiconductor P3HT, which is commonly used in polymer solar cells and photodetectors, is demonstrated to be able to act as a biocompatible optoelectronic interface for the retina of blind rats.
Researchers report the first direct measurements of the wavefunction and Dirac distributions for polarization states of light. Their implementation determines the general description of the pure state of a qubit. This technique is simple, fast and general, and has an advantage over the conventional approach of performing quantum state tomography.
Researchers observe Anderson localization for pairs of polarization-entangled photons in a discrete quantum walk affected by position-dependent disorder. By exploiting polarization entanglement of photons to simulate different quantum statistics, they experimentally investigate the interplay between the Anderson localization mechanism and the bosonic/fermionic symmetry of the wave function.
Researchers demonstrate quantum teleportation of six general states using an entangled-light-emitting diode consisting of an InAs quantum dot. The emission wavelength of quantum dots is readily tunable using electric fields. The average teleportation fidelity of 0.704±0.016 exceeds the limit possible with classical light, proving the quantum nature of the teleportation.
Researchers present a photonic demonstration of a full quantum algorithm without knowing the answer in advance. The unknown eigenvalues are truly calculated by the iterative phase estimation algorithm circuit. The demonstrated scheme is essential for practical applications of the phase estimation algorithm, including quantum simulations, quantum metrology and factoring.
Researchers use squeezed light to track the constituents of yeast cells with a performance that overcomes the quantum noise limit. This approach allows for the utilization of low optical power, which helps to minimize cell damage.
Colour filters that split light by employing near-field interference effects instead of absorption provide enhanced signal levels for dense, small-pixel image sensors.
Through simultaneous five-photon absorption, scientists observe efficient frequency-upconverted stimulated emission from the mid- or near-infrared to the visible region in a novel fluorophore. The fifth-order dependence on the input light intensity provides much stronger spatial confinement than lower-order nonlinear absorption, thus offering much higher contrast for imaging.
Researchers provide tight bounds for the classical information capacity of a Bosonic thermal noise channel. They also compare these limits with the well-known lower bound of the channel and an upper bound first introduced by Holevo and Werner in their seminal work on the subject.
Researchers detect nanoparticles and viruses with a field-of-view of 20 mm2 by using an optical scheme that employs digital holographic microscopy and self-assembled liquid nanolenses.
Researchers present a quantum receiver based on a novel adaptive measurement scheme and a high-bandwidth, high-detection-efficiency system for single-photon counting. The receiver unconditionally discriminates between four nonorthogonal coherent states with error probabilities 6 dB below the standard quantum limit for a wide range of input powers.
