Single optical photon detection with a superconducting tunnel junction

Article Abstract:

A niobium-based superconducting tunnel junction (STJ) is useful in detecting individual photons at rates up to 2.5 kHz in the wavelength range 200-500 nm. The STJ detects the photons with an intrinsic spectral resolution of 45 nm and at a quantum efficiency of nearly 50%. The device eliminates the limitations of charge-couple devices which provide linear response to photons. The device may be able to attain the limiting theoretical resolution of nearly 20 nm at 350 nm if the electronic noise is further reduced.

Research, Usage, Superconducting devices, Superconductive devices, Niobium, Photon detectors

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Superconducting superwires

Article Abstract:

The choice of the material for superconductor wires is primarily a matter of economic viability of the medium. Recent discoveries of thick-film superconducting tapes (Y-123) and ion-beam-assisted deposition process (IBAD) have given hope for a broader and commercially viable applications. The Y-123, developed by Los Alamos National laboratory, can carry more than 100 amperes of current with critical density of above one million A per square cm.

Materials

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Demonstration of controlled-NOT quantum gates on a pair of superconducting quantum bits

Article Abstract:

The complete set of four different controlled-NOT (CNOT) quantum logic gates developed by applying microwave pulses of appropriate frequency to a single pair of coupled flux qubits which could be used in quantum algorithms is demonstrated.

United States, Analysis, Observations, Optical properties, Atomic force microscopy, Mechanical properties, Flux (Metallurgy), Quantum computing

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