Article
Measurement of quantum weak values of photon polarization.
Centre for Quantum Computer Technology, Physics Department, The University of Queensland, Brisbane, Queensland 4072, Australia.
Physical Review Letters (Impact Factor: 7.73). 07/2005; 94(22):220405. DOI: 10.1103/PhysRevLett.94.220405 Source: PubMed

Conference Paper: Quantum discord with weak measurement operators of quasiWerner states based on bipartite entangled coherent states
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ABSTRACT: Among many applications quantum weak measurements have been shown to be important in exploring fundamental physics issues, such as the experimental violation of the Heisenberg uncertainty relation and the Hardy paradox, and have also technological implications in quantum optics, quantum metrology and quantum communications, where the precision of the measurement is as important as the precision of quantum state preparation. The theory of weak measurement can be formulated using the preand postselected quantum systems, as well as using the weak measurement operator formalism. In this work, we study the quantum discord (QD) of quasiWerner mixed states based on bipartite entangled coherent states using the weak measurements operator, instead of the projective measurement operators. We then compare the quantum discord for both kinds of measurement operators, in terms of the entanglement quality, the latter being measured using the concept of concurrence. It's found greater quantum correlations using the weak measurement operators.8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, Porto, Portugal; 11/2013  [Show abstract] [Hide abstract]
ABSTRACT: We study the outcomes in a general measurement with postselection, and derive upper bounds for the pointer readings in weak measurement. The probabilities inferred from weak measurements change along with the coupling strength; and the true probabilities can be obtained when the coupling is strong enough. By calculating the information gain of the measuring device about which path the particles pass through, we show that the "negative probabilities" only emerge for cases when the information gain is little due to very weak coupling between the measuring device and the particles. When the coupling strength increases, we can unambiguously determine whether a particle passes through a given path every time, hence the average shifts always represent true probabilities, and the strange "negatives probabilities" disappear.Physics Letters A 11/2013; 377(38):25052509. · 1.63 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Photonic spin Hall effect (SHE) manifesting itself as spindependent splitting escapes detection in previous photon tunneling experiments due to the fact that the induced beam centroid shift is restricted to a fraction of wavelength. In this work, we report on the first observation of this tiny effect in photon tunneling via weak measurements based on preselection and postselection technique on the spin states. We find that the spindependent splitting is even larger than the potential barrier thickness when spinpolarized photons tunneling through a potential barrier. This photonic SHE is attributed to spinredirection Berry phase which can be described as a consequence of the spinorbit coupling. These findings provide new insight into photon tunneling effect and thereby offer the possibility of developing spinbased nanophotonic applications.Scientific Reports 12/2014; 4:7388. · 5.08 Impact Factor
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