Generation of hyperentangled photon pairs.

By J. Barreiro, N. Langford, N. Peters, Paul G. Kwiat. Physical Review Letters, 2005

623 citations recorded by the source corpus.

We experimentally demonstrate the first quantum system entangled in every degree of freedom (hyperentangled). Using pairs of photons produced in spontaneous parametric down-conversion, we verify entanglement by observing a Bell-type inequality violation in each degree of freedom: polarization, spatial mode, and time energy. We also produce and characterize maximally hyperentangled states and novel states simultaneously exhibiting both quantum and classical correlations. Finally, we report the tomography of a 2 x 2 x 3 x 3 system (36-dimensional Hilbert space), which we believe is the first reported photonic entangled system of this size to be so characterized.

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

View Paper: https://www.semanticscholar.org/paper/8eb38b16529e0b8e174702d786a33405208ae49b

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Citations in the corpus

Spin-to-orbital conversion of the angular momentum of light and its classical and quantum applications (2011, background): “degrees of freedom of two particles are simultaneously entangled [84, 85].”
Observation of eight-photon entanglement (2011, methodology): “As well as the eight-photon technique, we can also take advantage of the photons' other degrees of freedom (such as spatial mode andsor orbital angular momentum) to further expand the Hilbert spac”
Linear optical quantum computing with photonic qubits (2005, background): “This type of entanglement is sometimes called hyper-entanglement, since it involves more than one observable of a single system (Kwiat and Weinfurter 1998; Barreiro et al. 2005; Cinelli et al. 2005).”
Beating the channel capacity limit for linear photonic superdense coding (2008, methodology): “The hyperentanglement source is realized by directing 120 mW of 351 nm light from a continuous-wave (CW) Ar laser into two contiguous β-barium borate (BBO) nonlinear crystals with optic axes aligned in perpendicular planes [9].”
Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies (2021, background): “and spatial mode, and hyperentanglement [75], between multiple corresponding degrees of freedom of two pho-”
Quantum metrology and its application in biology (2014, background): “ion process are dictated by energy and momentum conservation. In general, many pairs of spatial modes are each populated with correlated photons. These photons are termed to be \hyper-entangled" [86], since they can exhibit not only temporal correlations, but also correlations in their momentum”
Optimal quantum cloning of orbital angular momentum photon qubits through Hong–Ou–Mandel coalescence (2009, background): “, and the combined use of the different degrees of freedom of a photon, such as OAM and spin, enables the implementation of entirely new quantum task”
One-step quantum secure direct communication. (2021, background): “Hyperentanglement [45], which means the simultaneous entanglement in more than one DOF, has been widely investigated in increasing the channel capacity [46–48], entanglement puriﬁca-tion [49–52], complete BSA [53,54], and teleportation in multiple DOFs [16,17].”
Multiphoton entanglement and interferometry (2008, neutral): “In an experiment by Barreiro et al (2005), besides the entanglement in polarization and in energy, photon pairs from a single nonlinear crystal were also entangled in orbital angular momentum.”