期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 42, 页码 26118-26122出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2011405117
关键词
entanglement by path identity; high-dimensional entanglement; path indistinguishability; orbital angular momentum
资金
- Austrian Academy of Sciences
- European Research Council (Simulators and Interfaces with Quantum Systems [SIQS]) [600645 EU-FP7-ICT]
- Austrian Science Fund [F40, W 1210-N25]
- University of Vienna via the project QUESS (Quantum Experiments on Space Scale)
We present an experimental demonstration of a general entanglement-generation framework, where the form of the entangled state is independent of the physical process used to produce the particles. It is the indistinguishability of multiple generation processes and the geometry of the setup that give rise to the entanglement. Such a framework, termed entanglement by path identity, exhibits a high degree of customizability. We employ one class of such geometries to build a modular source of photon pairs that are high-dimensionally entangled in their orbital angular momentum. We demonstrate the creation of three-dimensionally entangled states and show how to incrementally increase the dimensionality of entanglement. The generated states retain their quality even in higher dimensions. In addition, the design of our source allows for its generalization to various degrees of freedom and even for the implementation in integrated compact devices. The concept of entanglement by path identity itself is a general scheme and allows for construction of sources producing also customized states of multiple photons. We therefore expect that future quantum technologies and fundamental tests of nature in higher dimensions will benefit from this approach.
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