Experimental Constraint on an Exotic Parity-Odd Spin- and Velocity-Dependent Interaction with a Single Electron Spin Quantum Sensor

Improved laboratory limits on the exotic spin- and velocity-dependent interaction at the micrometer scale are established with a single electron spin quantum sensor. The single electron spin of a near-surface nitrogen-vacancy center in diamond is used as the quantum sensor, and a fused-silica half-sphere lens is taken as the source of the moving nucleons. The exotic interaction between the polarized electron and the moving nucleon source is explored by measuring the possible magnetic field sensed by the electron spin quantum sensor. Our experiment sets improved constraints on the exotic spin- and velocity-dependent interaction within the force range from 1.4 to 330 mu m. The upper limit of the coupling g(A)(e)g(V)(N) at 200 mu m is vertical bar g(A)(e)g(V)(N)vertical bar <= 5.3 x 10(-19), significantly improving the current laboratory limit by more than 4 orders of magnitude.

Automated summary

Improved laboratory limits on the exotic spin- and velocity-dependent interaction at the micrometer scale were established using a single electron spin quantum sensor, showing significant improvement in constraints and reaching an upper limit of the coupling at 200 mu m.