Massive spin-momentum entanglement measured in an atomic beam spin echo experiment
Physikalisches Institut Universität Heidelberg,
Philosophenweg 12, 69120
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Received in final form: 14 June 2011
Published online: 17 June 2011
In this paper we present an experiment performed with an atomic beam spin echo interferometer, in which massive intraparticle entanglement is demonstrated. In the longitudinal Stern-Gerlach arrangement the nuclear spin and linear momentum of 3He particles are inextricably linked, such that the overall system state cannot be written as the tensor product of the corresponding Hilbert spaces. The measured data show maximal entanglement between ℋI and ℋp. This hybrid system of one quantum and one classical degree of freedom is a textbook example of entanglement between discrete and continuous observables.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011