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Fidelity of qubit rotations in the presence of thermal motion


  Anat Daniel  ,  Ruti Agou  ,  Omer Amit  ,  David Groswasser  ,  Yonathan Japha  ,  Ron Folman  
 Ben Gurion University

 We investigate both theoretically and experimentally the effect of real-life imperfections on the

delity of qubit rotations in the presence of thermal motion. Speci cally we develop a model
predicting the coherence time of Rabi oscillations in the presence of an inhomogeneous driving
field or Ramsey oscillations in the presence of an inhomogeneous state-selective potential. We
demonstrate the theoretical dependence by an experiment observing the coherence time in a volume
much smaller than the entire sample.