Weak measurements with orbital-angular-momentum pointer states
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Weak measurements are a unique tool for accessing information about weakly interacting quantum systems with minimal back action. Joint weak measurements of single-particle operators with pointer states characterized by a two-dimensional Gaussian distribution can provide, in turn, key information about quantum correlations that can be relevant for quantum information applications. Here we demonstrate that by employing two-dimensional pointer states endowed with orbital angular momentum (OAM), it is possible to extract weak values of the higher order moments of single-particle operators, an inaccessible quantity with Gaussian pointer states only. We provide a specific example that illustrates the advantages of our method both in terms of signal enhancement and information retrieval.
CitationPuentes, G.; Hermosa, N.; Perez, J. Weak measurements with orbital-angular-momentum pointer states. "Physical review letters", 24 Juliol 2012, vol. 109, núm. 4, p. 040401-1-040401-5.