Since the first proof-of-principle experiments over 25 years ago, atom interferometry has
matured to a versatile tool that can be used in fundamental research in particle physics …

This review describes recent groundbreaking results in Si, Si/SiGe, and dopant-based
quantum dots, and it highlights the remarkable advances in Si-based quantum physics that …

1.1. Background This paper gives the complete 2006 CODATA self-consistent set of
recommended values of the fundamental physical constants and describes in detail the …

The control of electrons at the level of the elementary charge e was demonstrated
experimentally already in the 1980s. Ever since, the production of an electrical current ef, or …

Quantum computers hold the promise of massive performance enhancements across a
range of applications, from cryptography and databases to revolutionary scientific simulation …

When the kilogram is redefined in terms of the fixed numerical value of the Planck constant
h, the x-ray-crystal-density (XRCD) method, among others, is used for realizing the redefined …

New results are reported from an ongoing international research effort to accurately
determine the Avogadro constant by counting the atoms in an isotopically enriched silicon …

Quantum computers have the potential to efficiently solve problems in logistics, drug and
material design, finance, and cybersecurity. However, millions of qubits will be necessary for …

Historically, time measurements have been based on oscillation frequencies in systems of
particles, from the motion of celestial bodies to atomic transitions. Relativity and quantum …

Abstract We describe the Quantum Test of the Equivalence principle and Space Time
(QTEST), a concept for an atom interferometry mission on the International Space Station …