Quantum Entanglement of High Angular Momenta

By Robert Fickler, Radek Lapkiewicz, W. Plick, Mario Krenn, Christoph Schaeff, S. Ramelow, Anton Zeilinger. Science, 2012

743 citations recorded by the source corpus.

Twist and Entangle Entanglement is a key feature in quantum information science and plays an important role in various applications of quantum mechanics. Fickler et al. (p. 640) present a method for converting the polarization state of photons into information encoded into spatial modes of a single photon. From this, superposition states and entangled photons with very high orbital angular momentum quantum numbers were generated. A method to entangle photons with very-high–orbital angular momentum quantum numbers advances quantum information science. Single photons with helical phase structures may carry a quantized amount of orbital angular momentum (OAM), and their entanglement is important for quantum information science and fundamental tests of quantum theory. Because there is no theoretical upper limit on how many quanta of OAM a single photon can carry, it is possible to create entanglement between two particles with an arbitrarily high difference in quantum number. By transferring polarization entanglement to OAM with an interferometric scheme, we generate and verify entanglement between two photons differing by 600 in quantum number. The only restrictive factors toward higher numbers are current technical limitations. We also experimentally demonstrate that the entanglement of very high OAM can improve the sensitivity of angular resolution in remote sensing.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/dc29badb08392d5bdf4fff6f5c1ef55d320db55c

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Citations in the corpus

A quantum memory for orbital angular momentum photonic qubits (2013, background): “These advances include quantum cryptography [10], bit commitment [11], experimental quantum coin tossing [12], and more recently, the demonstration of very high-dimensional entanglement [13, 14].”
Coherent optical vortices from relativistic electron beams (2013, background): “Light beams that carry orbital angular momentum (OAM) have become the subject of intense interest for numerous applications[1], including particle micro-manipulation[2], microscopy[3], imaging[4], optical pump schemes[5], quantum entanglement[6], and communications[7].”
Communication with spatially modulated light through turbulent air across Vienna (2014, methodology): “long distances, which requires good distinguishability of angles of 45°. For such an experiment, we would need to extent our method to observe coincidence intensity patterns at the singlephoton level [33]. We expect this to be possible by replacing our screen with a triggered ICCD camera, without an”
Orbital Angular Momentum States Enabling Fiber-based High-dimensional Quantum Communication (2018, background): “qudits increase the information content per photon [20,21],”
High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges (2019, background): “[15] to achieve increased sensitivity in quantum imaging schemes [16], they can boost the transport efficiency of biological compounds [17], they constitute richer resources for quantum simulation [18, 19], they lead to higher efficiencies in quantum computing [20–23] and clock synchronization [24],”