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Detecting single infrared photons with 93% system efficiency
Researchers develop a fiber-coupled single-photon-detection system using amorphous tungsten silicide superconducting nanowire single-photon detectors. The system detection efficiency is higher than…
A strong loophole-free test of local realism
An loophole-free test of Bells inequalities and the probability that local realism is compatible with the results is less than 5.9×10<sup>-9</sup>.
Significant-Loophole-Free Test of Bell's Theorem with Entangled Photons.
A Bell test is reported that closes the most significant of loopholes that provide loopholes for a local realist explanation of quantum mechanics, using a well-optimized source of entangled photons, rapid setting generation, and highly efficient superconducting detectors.
Rabi oscillations in a large Josephson-junction qubit.
A circuit based on a large-area current-biased Josephson junction whose two lowest energy quantum levels are used to implement a solid-state qubit is designed and operated and is the basis of a scalable quantum computer.
Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors
The keys generated in the first quantum key distribution experiment to enable the creation of secure keys over 42 dB channel loss and 200 km of optical fibre are secure against both general collective attacks on individual photons and a specific collective attack on multiphotons.
Counting near-infrared single-photons with 95% efficiency.
The fabrication and evaluation of a fiber-coupled, photon-number-resolving TES detector optimized for absorption at 1550 and 1310 nm wavelengths is described, which to the authors' knowledge is the highest system detection efficiency reported for a near-infrared single-photon detector.
Bell violation using entangled photons without the fair-sampling assumption
This experiment makes the photon the first physical system for which each of the main loopholes has been closed, albeit in different experiments, and uses the Eberhard form of Bell’s inequality, which allows a lower collection efficiency than other forms.
Detection of single infrared, optical, and ultraviolet photons using superconducting transition edge sensors
We have demonstrated the use of superconducting transition edge sensors for the wide-band detection of individual photons from the mid infrared (IR), through the optical, and into the far ultraviolet…
Demonstration of a low-noise near-infrared photon counter with multiphoton discrimination
We have demonstrated a system capable of directly measuring the photon-number state of a single pulse of light using a superconducting transition-edge sensor microcalorimeter. We verify the…
Decoherence of a superconducting qubit due to bias noise
We calculate for the current-biased Josephson junction the decoherence of the qubit state from noise and dissipation. The effect of dissipation can be entirely accounted for through a semiclassical…