Quantum metrology at the Heisenberg limit with ion trap motional compass states
Diego A. R. Dalvit, R. L. de Matos Filho, Fabricio Toscano · New Journal of Physics · 2006
Sub-Planck phase-space structures in the Wigner function of the motional degree of freedom of a trapped ion can be used to perform weak force measurements with Heisenberg-limited sensitivity. We propose methods to engineer the Hamiltonian of the trapped ion to generate states with such small-scale structures, and we show how to use them in quantum metrology applications.