Probing Qubit Memory Errors at the Part-per-Million Level

A measurement of the absorption of liquid argon scintillation light by dissolved nitrogen at the part-per- million level

We report on a measurement of the absorption length of scintillation light in liquid argon due to dissolved nitrogen at the part-per-million (ppm) level. We inject controlled quantities of nitrogen into a high purity volume of liquid argon and monitor the light yield from an alpha source. The source is placed at different distances from a cryogenic photomultiplier tube assembly. By comparing th...

The linear polarization of nearby bright stars measured at the parts per million level

We report observations of the linear polarization of a sample of 49 nearby bright stars measured to sensitivities of between ∼1 and ∼4 ×10. The majority of stars in the sample show measurable polarization, but most polarizations are small with 75% of the stars having P < 2 ×10. Correlations of the polarization with distance and position, indicate that most of the polarization is of interstellar...

Parts-per-million level loading organocatalysed enantioselective silylation of alcohols.

The field of organocatalysis has blossomed over the past few decades, becoming an alternative to transition-metal catalysis or even replacing the realm of transition-metal catalysis. However, a truly powerful organocatalyst with a high turnover number (TON) and turnover frequency (TOF) while retaining high enantioselectivity is yet to be discovered. Similar to metal catalysis, extremely low cat...

Quantum error correction for continuously detected errors with any number of error channels per qubit

Copper-catalyzed N-arylation of amines with part-per-million catalyst loadings under air at room temperature.

An efficient copper-catalyzed method for N-arylation of amines has been developed with part-per-million catalyst loadings at room temperature under air. Reactions of substituted (E)-1-(2-halophenyl)alkanone oximes with aliphatic amines or aromatic amines provided the N-arylation products in good to excellent yields.