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49 results on '"Wiseman, H.M."'

1. Entanglement-free Heisenberg-limited phase estimation

Author

Higgins, B.L., Berry, D.W., Bartlett, S.D., Wiseman, H.M., and Pryde, G.J.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Measurement underpins all quantitative science. A key example is the measurement of optical phase, used in length metrology and many other applications. Advances in precision measurement have consistently led to [...]

Published
2007

2. From Einstein's theorem to Bell's theorem: a history of quantum non-locality

Author

Wiseman, H.M.

Subjects
Bell's theorem -- Analysis, Quantum theory -- Research, Physics
Abstract

In this Einstein Year of Physics it seems appropriate to look at an important aspect of Einstein's work that is often down-played: his contribution to the debate on the interpretation of quantum mechanics. Contrary to physics 'folklore', Bohr had no defence against Einstein's 1935 attack (the EPR paper) on the claimed completeness of orthodox quantum mechanics. I suggest that Einstein's argument, as stated most clearly in 1946, could justly be called Einstein's reality--locality--completeness theorem, since it proves that one of these three must be false. Einstein's instinct was that completeness of orthodox quantum mechanics was the falsehood, but he failed in his quest to find a more complete theory that respected reality and locality. Einstein's theorem, and possibly Einstein's failure, inspired John Bell in 1964 to prove his reality locality theorem. This strengthened Einstein's theorem (but showed the futility of his quest) by demonstrating that either reality or locality is a falsehood. This revealed the full non-locality of the quantum world for the first time.

Published
2006

6. The simplest demonstrations of quantum nonlocality

Author

Saunders, D.J., Palsson, M.S., Pryde, G.J., Scott, A.J., Barnett, S.M., and Wiseman, H.M.

Subjects
Quantum Physics
Abstract

We investigate the complexity cost of demonstrating the key types of nonclassical correlations—Bell inequality violation, Einstein, Podolsky, Rosen (EPR)-steering, and entanglement—with independent agents, theoretically and in a photonic experiment. We show that the complexity cost exhibits a hierarchy among these three tasks, mirroring the recently discovered hierarchy for how robust they are to noise. For Bell inequality violations, the simplest test is the well-known Clauser–Horne–Shimony–Holt test, but for EPR-steering and entanglement the tests that involve the fewest number of detection patterns require nonprojective measurements. The simplest EPR-steering test requires a choice of projective measurement for one agent and a single nonprojective measurement for the other, while the simplest entanglement test uses just a single nonprojective measurement for each agent. In both of these cases, we derive our inequalities using the concept of circular two-designs. This leads to the interesting feature that in our photonic demonstrations, the correlation of interest is independent of the angle between the linear polarizers used by the two parties, which thus require no alignment.

Published
2012

20. CORRESPONDENCE.

Author

Gerrard, M.A., Youngs, Alfred, Grant, R.H.E., Widdop, B., Levitt, T., Adams, Rosemary H.M., Dallos, V., Daniels, R.G., Helps, P.J., Rogers, N.C., Guest, K.P., Rose, D., Wiseman, H.M., Volans, Glyn N., Chiswick, Malcolm L., Zachary, R.B., Jarvis, Gerald J., and McKinley, W.J.D.

Subjects
MEDICINE, PUBLIC health, PRENATAL diagnosis
Abstract

Reports developments related to medicine in Great Britain. Arguments on the abolition of community health councils; Measurement of plasma level of paracetamol; Importance of antenatal assessment for fetal and maternal health.

Published
1980

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