Science Alert February 24, 2023 Ghost imaging involves the exploitation of non-local photon spatial correlations to image objects with light that has not interacted with them and, using intelligent spatial scanning with projective masks, reduces detection to a single pixel. Despite many applications, extension to complex amplitude objects remains challenging. Researchers in South Africa revealed that the necessary interference for phase retrieval was naturally embedded in the correlation measurements formed from traditional projective masks in bi-photon quantum ghost imaging. Using this, they developed a simple approach to obtain the full phase and amplitude information of complex objects. They demonstrated straightforward […]
Tag Archives: Entangled light
Qubits on strong stimulants
Science Daily January 27, 2023 Optically active semiconductor quantum dots have unparalleled photonic properties, but also modest spin coherence limited by their resident nuclei. The nuclear inhomogeneity has thus far bound all dynamical decoupling measurements to a few microseconds. An international team of researchers (UK, Austria) eliminated the inhomogeneity using lattice-matched GaAs–AlGaAs quantum dot devices and demonstrated dynamical decoupling of the electron spin qubit beyond 0.113(3) ms. Leveraging the 99.30(5)% visibility of our optical π-pulse gates, we use up to Nπ = 81 decoupling pulses and find a coherence times hundreds of microseconds. This scaling manifests an ideal refocusing of strong interactions between the electron and the […]