Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 3 de 3
Filter
Add more filters










Database
Language
Publication year range
1.
Phys Rev Lett ; 129(9): 090402, 2022 Aug 26.
Article in English | MEDLINE | ID: mdl-36083651

ABSTRACT

While the standard formulation of quantum theory assumes a fixed background causal structure, one can relax this assumption within the so-called process matrix framework. Remarkably, some processes, termed causally nonseparable, are incompatible with a definite causal order. We explore a form of certification of causal nonseparability in a semi-device-independent scenario where the involved parties receive trusted quantum inputs, but whose operations are otherwise uncharacterized. Defining the notion of causally nonseparable distributed measurements, we show that certain causally nonseparable processes that cannot violate any causal inequality, including the canonical example of the quantum switch, can generate noncausal correlations in such a scenario. Moreover, by imposing some further natural structure to the untrusted operations, we show that all bipartite causally nonseparable process matrices can be certified with trusted quantum inputs.

2.
Opt Express ; 25(16): 19654, 2017 08 07.
Article in English | MEDLINE | ID: mdl-29041157

ABSTRACT

A sign error in the handedness of the rotating eigenpolarization pattern is corrected. This correction implies that a bottle field can be produced using just a stress-engineered optical element, without the need for a half-wave plate.

3.
Opt Express ; 25(8): 9318-9332, 2017 Apr 17.
Article in English | MEDLINE | ID: mdl-28438008

ABSTRACT

An optical bottle field containing a three-dimensional intensity null at the focal point can be generated by placing a spatially inhomogeneous birefringent mask at the pupil of an aplanatic high-NA focusing system. We derive the optimal birefringence distribution for which a uniformly polarized input beam is converted into a bottle field with the sharpest possible null in intensity. We show that a stress engineered optical (SEO) window, which has a radially varying retardance, followed by a half-wave plate, performs nearly as well as the optimal solution. Experimental results corroborate that an SEO element can be used to generate a bottle field.

SELECTION OF CITATIONS
SEARCH DETAIL
...