Southwest Quantum Information and Technology

Faithful conversion of propagating quantum bits to mechanical motion

Presenting Author: Karl Mayer, CU Boulder; NIST
Contributing Author(s): Adam Reed, John Teufel, Matt Reagor, Luke Burkhart, Wolfgang Pfaff, Rob Schoelkopf and Konrad Lehnert

Electromechanical devices are emerging as quantum information processing elements for superconducting circuits. By using a mechanical oscillator parametrically coupled to a microwave resonant circuit, these devices can store, amplify, and frequency-convert microwave fields. Experimental efforts to convert microwave fields to mechanical motion have so far been mostly limited to Gaussian states, such as coherent or squeezed states. We present experiments that demonstrate and characterize the conversion of non-Gaussian states, namely propagating microwave qubits prepared in mixed single-photon and superposition states. We perform state tomography to infer the density matrices for both the input states and the mechanical states after conversion, and compute the average fidelity for this conversion process to be in excess of 80%.

(Session 3 : Thursday from 2:30pm - 3:00pm)