|
| related topics |
| {photon, photons, single} |
| {bell, inequality, local} |
| {cos, sin, state} |
| {light, field, probe} |
| {state, states, entangled} |
| {qubit, qubits, gate} |
| {group, space, representation} |
|
A method for reaching detection efficiencies necessary for optical
loophole-free Bell experiments
Mladen Pavicic
abstract: A method for preparing a loophole-free four-photon Bell experiments which
requires a detection efficiency of 67% is proposed. It enables realistic
detection efficiencies of 75% at a visibility of 85%. Two type-II crystals each
down convert one correlated photon pair and we entangle one photon from one
pair with one photon from the other pair on a highly transparent beam splitter.
The entanglement selects two other conjugate photons into a Bell state. Wide
solid angles for the conjugate photons then enable us to collect close to 100%
of them. The cases when both photon pairs come from only one of the two
crystals are successfully taken into account. Hardy's equalities are discussed.
- oai_identifier:
- oai:arXiv.org:quant-ph/9907039
- categories:
- quant-ph
- comments:
- RevTeX, 20 pages, 2figures, Author's URL http://m3k.grad.hr/pavicic
- doi:
- 10.1016/S0030-4018(97)00285-X
- arxiv_id:
- quant-ph/9907039
- journal_ref:
- Opt.Commun. 142 (1997) 308-314
- created:
- 1999-07-09
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