Observation of one-way Einstein–Podolsky–Rosen steering

By V. Händchen, T. Eberle, S. Steinlechner, A. Samblowski, T. Franz, Reinhard F. Werner, Roman Schnabel. Nature Photonics, 2012

336 citations recorded by the source corpus.

The distinctive non-classical features of quantum physics were first discussed in the seminal paper1 by A. Einstein, B. Podolsky and N. Rosen (EPR) in 1935. In his immediate response2, E. Schrödinger introduced the notion of entanglement, now seen as the essential resource in quantum information3,4,5 as well as in quantum metrology6,7,8. Furthermore, he showed that at the core of the EPR argument is a phenomenon that he called steering. In contrast to entanglement and violations of Bell's inequalities, steering implies a direction between the parties involved. Recent theoretical works have precisely defined this property, but the question arose as to whether there are bipartite states showing steering only in one direction9,10. Here, we present an experimental realization of two entangled Gaussian modes of light that in fact shows the steering effect in one direction but not in the other. The generated one-way steering gives a new insight into quantum physics and may open a new field of applications in quantum information. Recent theory predicts that Einstein–Podolsky–Rosen arguments enable an effect in which one party can steer the other but not the converse. Researchers have now demonstrated this one-way steering effect with two entangled Gaussian modes of light, potentially opening up a new field of applications in quantum information.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/772f8f5a510b0391d07967f3fb49ce27b813e13d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Roman Schnabel

In Atomic and Molecular Physics, and Optics

In Statistical and Nonlinear Physics

Citations in the corpus

Squeezed states of light and their applications in laser interferometers (2016, background): “Note that the EPR paradox can also be described as ‘quantum steering’ [Schrödinger (1935); Cavalcanti et al. (2009); Händchen et al. (2012)].”
Multipartite Einstein–Podolsky–Rosen steering and genuine tripartite entanglement with optical networks (2014, background): “For bipartite EPR states, there are 3 different regimes: 2-way, 1-way, and no-way steering [25, 26].”
Inequivalence of entanglement, steering, and Bell nonlocality for general measurements (2015, background): “First investigated in the context of Gaussian systems [26,27], the effect of one-way steerability was demonstrated for simple two-qubit states, but only for projective measurements [28].”