Reference : Tensor Representation of Spin States
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/178741
Tensor Representation of Spin States
English
Giraud, Olivier [LPTMS, CNRS and Université Paris-Sud > > > >]
Braun, Daniel [Institut für theoretische Physik, Universität Tübingen > > > >]
Baguette, Dorian mailto [Université de Liège - ULiège > Département de physique > Optique quantique >]
Bastin, Thierry mailto [Université de Liège - ULiège > Département de physique > Spectroscopie atomique et Physique des atomes froids >]
Martin, John mailto [Université de Liège - ULiège > Département de physique > Optique quantique >]
27-Feb-2015
Physical Review Letters
American Physical Society
114
080401
Yes (verified by ORBi)
International
0031-9007
1079-7114
Ridge
NY
[en] Spin ; anticoherence ; qubits
[en] We propose a generalization of the Bloch sphere representation for arbitrary spin states. It provides a compact and elegant representation of spin density matrices in terms of tensors that share the most important properties of Bloch vectors. Our representation, based on covariant matrices introduced by Weinberg in the context of quantum field theory, allows for a simple parametrization of coherent spin states, and a straightforward transformation of density matrices under local unitary and partial tracing operations. It enables us to provide a criterion for anticoherence, relevant in a broader context such as quantum polarization of light.
http://hdl.handle.net/2268/178741
also: http://hdl.handle.net/2268/183396
10.1103/PhysRevLett.114.080401

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