|
| related topics |
| {measurement, state, measurements} |
| {state, states, coherent} |
| {time, decoherence, evolution} |
| {energy, gaussian, time} |
| {entanglement, phys, rev} |
| {wave, scattering, interference} |
| {state, phys, rev} |
|
Nonclassical Properties of Coherent States
Lars M. Johansen
abstract: It is demonstrated that a weak measurement of the squared quadrature
observable may yield negative values for coherent states. This result cannot be
reproduced by a classical theory where quadratures are stochastic $c$-numbers.
The real part of the weak value is a conditional moment of the Margenau-Hill
distribution. The nonclassicality of coherent states can be associated with
negative values of the Margenau-Hill distribution. A more general type of weak
measurement is considered, where the pointer can be in an arbitrary state, pure
or mixed.
- oai_identifier:
- oai:arXiv.org:quant-ph/0309025
- categories:
- quant-ph
- comments:
- 4 pages. Some arguments rewritten, reference added to
quant-ph/0402050. Conclusion unchanged
- doi:
- 10.1016/j.physleta.2004.07.003
- arxiv_id:
- quant-ph/0309025
- journal_ref:
- Phys. Lett. A 329 (2004) 184-187
- created:
- 2003-09-02
- updated:
- 2004-02-07
Full article ▸
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