T.J.Watson Laboratory of Applied Physics;
California Institute of Technology;
Pasadena;
CA 91125;
USA;
Research Laboratory of Electronics;
MIT-Harvard Center for Ultracold Atoms;
Department of Physics;
Massachusetts Institute of Technology;
Cambridge;
MA;
USA;
Rockley Photonics Inc.;
Pasadena;
CA;
USA;
Apple Inc.;
Cupertino;
CA;
USA;