New High-Intensity Source of Polarization-Entangled Photon Pairs

Kwiat, Paul G.; Mattle, Klaus; Weinfurter, Harald; Zeilinger, Anton; Sergienko, Alexander V.; Shih, Yanhua

doi:10.1103/physrevlett.75.4337

Cited by 2,895 publications

(2,598 citation statements)

References 34 publications

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“…Experimentally, the realization of quantum teleportation of an independent single photon necessitates the simultaneous creation of two entangled photon pairs 15 and high-visibility quantum interference between them 7 . The multi-photon coincidence count rate is several orders of magnitude lower compared to typical single-or twophoton experiments.…”

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confidence: 99%

Ground-to-satellite quantum teleportation

Ren

Yong

et al. 2017

Nature

697

378

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An arbitrary unknown quantum state cannot be precisely measured or perfectly replicated. However, quantum teleportation allows faithful transfer of unknown quantum states from one object to another over long distance, without physical travelling of the object itself. Long-distance teleportation has been recognized as a fundamental element in protocols such as large-scale quantum networks and distributed quantum computation. However, the previous teleportation experiments between distant locations were limited to a distance on the order of 100 kilometers, due to photon loss in optical fibres or terrestrial free-space channels. An outstanding open challenge for a global-scale "quantum internet" is to significantly extend the range for teleportation. A promising solution to this problem is exploiting satellite platform and space-based link, which can conveniently connect two remote points on the Earth with greatly reduced channel loss because most of the photons' propagation path is in empty space. Here, we report the first quantum teleportation of independent single-photon qubits from a ground observatory to a low Earth orbit satellite - through an up-link channel - with a distance up to 1400 km. To optimize the link efficiency and overcome the atmospheric turbulence in the up-link, a series of techniques are developed, including a compact ultra-bright source of multi-photon entanglement, narrow beam divergence, high-bandwidth and high-accuracy acquiring, pointing, and tracking (APT). We demonstrate successful quantum teleportation for six input states in mutually unbiased bases with an average fidelity of 0.80+/-0.01, well above the classical limit. This work establishes the first ground-to-satellite up-link for faithful and ultra-long-distance quantum teleportation, an essential step toward global-scale quantum internet.Comment: 16 pages, 3 figure

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confidence: 99%

Ground-to-satellite quantum teleportation

Ren

Yong

et al. 2017

Nature

697

378

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“…We apply this picture to the case of a qubit pair described by a mixed state and then quantify the quantum entanglement of the pair 1 . Qubits are not restricted to the real spin of electrons and can represent any two-state quantum system, for example, entangled photons pairs [14], flux qubits in superconducting rings [15], charge qubits in double quantum dots [16], flying qubits in quantum point contacts [17] or two-qubit systems with different types of particles [18].…”

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Geometric analysis of entangled qubit pairs

Ramšak

2011

New J. Phys.

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“…Different systems [4] (photons, atoms, spins, and superconducting and nanomechanical structures) are being used to build quantum devices. Among the optical implementations of quantum information technologies, the most popular one uses photon polarization as a natural two-level system (qubit) [5]. Implementations based on the spatial and temporal [6] degrees of freedom of light have also been used.…”

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confidence: 99%

Single plane minimal tomography of double slit qubits

Sogamoso¹,

Angulo²,

Romero³

2017

Optics Communications

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The determination of the density matrix of an ensemble of identically prepared quantum systems by performing a series of measurements, known as quantum tomography, is minimal when the number of outcomes is minimal.The most accurate minimal quantum tomography of qubits, sometimes called a tetrahedron measurement, corresponds to projections over four states which can be represented on the Bloch sphere as the vertices of a regular tetrahedron. We investigate whether it is possible to implement the tetrahedron measurement of double slit qubits of light, using measurements performed on a single plane. Assuming Gaussian slits and free propagation, we demonstrate that a judicious choice of the detection plane and the double slit geometry allows the implementation of a tetrahedron measurement. Finally, we consider possible sets of values which could be used in actual experiments.

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New High-Intensity Source of Polarization-Entangled Photon Pairs

Cited by 2,895 publications

References 34 publications

Ground-to-satellite quantum teleportation

Ground-to-satellite quantum teleportation

Geometric analysis of entangled qubit pairs

Single plane minimal tomography of double slit qubits

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