Generation of pulsed polarization-entangled photon pairs in a 155-µm band with a periodically poled lithium niobate waveguide and an orthogonal polarization delay circuit

Takesue, Hiroki; Inoue, Kyo; Tadanaga, O.; Nishida, Y.; Asobe, Masaki

doi:10.1364/ol.30.000293

Cited by 80 publications

(42 citation statements)

References 11 publications

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“…The conventional method to generate correlated photon-pairs is the use of parametric down conversion in bulk nonlinear crystals. Periodically poled lithium niobate (PPLN) waveguides have been used recently to generate correlated photon-pairs due to their high conversion efficiency compared to their bulk counterparts [1][2][3][4][5]. Furthermore, waveguide devices can be fiber pigtailed to achieve higher collection efficiency, as well as easy and stable operation.…”

Section: Introductionmentioning

confidence: 99%

Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

Zhang¹,

Xie²,

Takesue³

et al. 2007

Opt. Express

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Abstract:We report 10-ps correlated photon pair generation in periodically-poled reverse-proton-exchange lithium niobate waveguides with integrated mode demultiplexer at a wavelength of 1.5-μm and a clock of 10 GHz. Using superconducting single photon detectors, we observed a coincidence to accidental count ratio (CAR) as high as 4000. The developed photon-pair source may find broad application in quantum information systems as well as quantum entanglement experiments.

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Section: Introductionmentioning

confidence: 99%

Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

Zhang¹,

Xie²,

Takesue³

et al. 2007

Opt. Express

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“…Although practical entanglement sources based on parametric down conversion (PDC) have been reported and widely used in the short wavelength band [5,6], what is needed most for scalable quantum communication networks over optical fiber is a practical entanglement source in the 1.5-µm band, where silica fiber has its minimum loss. Several polarization entanglement sources in the 1.5-µm band have already been reported [7,8,9,10]. However, when transmitting polarization entangled photons over optical fiber, polarization mode dispersion (PMD) causes decoherence, which limits the transmission length.…”

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confidence: 99%

Generation of1.5−μmband time-bin entanglement using spontaneous fiber four-wave mixing and planar light-wave circuit interferometers

2005

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This paper reports 1.5-µm band time-bin entanglement generation. We employed a spontaneous four-wave mixing process in a dispersion shifted fiber, with which correlated photon pairs with very narrow bandwidths were generated efficiently. To observe two-photon interference, we used planar lightwave circuit based interferometers that were operated stably without feedback control. As a result, we obtained coincidence fringes with 99 % visibilities after subtracting accidental coincidences, and successfully distributed entangled photons over 20-km standard single-mode fiber without any deterioration in the quantum correlation.PACS numbers: 42.50. Dv, 42.65.Lm, 03.67.Hk In recent years, the generation and distribution of entangled photon pairs have been studied intensively with a view to realizing such forms of quantum communication as quantum cryptography [1,2], quantum teleportation [3] and quantum repeaters [4]. Although practical entanglement sources based on parametric down conversion (PDC) have been reported and widely used in the short wavelength band [5,6], what is needed most for scalable quantum communication networks over optical fiber is a practical entanglement source in the 1.5-µm band, where silica fiber has its minimum loss. Several polarization entanglement sources in the 1.5-µm band have already been reported [7,8,9,10]. However, when transmitting polarization entangled photons over optical fiber, polarization mode dispersion (PMD) causes decoherence, which limits the transmission length. Therefore, polarization entanglement is not the best choice for quantum communication over optical fiber.Time-bin entanglement has been proposed to overcome this problem [11]. This scheme is based on qubits spanned by two time slots instead of two polarization modes, and so is unaffected by PMD. Although degenerated photon pairs in the 1.3-µm band [11] and nondegenerated photon pairs in the 1.3/1.5-µm band [12] have been reported with this scheme, the use of photon pairs where both photons are in the 1.5-µm band is obviously the most effective way of increasing the transmission length. Recently, a Hong-Ou-Mandel experiment using quantum correlated photon pairs both in the 1.5-µm band was demonstrated by Halder et al. [13]. However, the direct observation of the degree of entanglement on time-bin entangled photons in the 1.5-µm band has * Electronic address: htakesue@will.brl.ntt.co.jp; yet to be achieved. The large bandwidths of the previous entangled photon-pair sources pose another problem. Although there have been a few reports on entangled photon-pair sources with narrow bandwidths [9,13], most of the previous time-bin entanglement experiments employed PDC that generated photon pairs with a typical bandwidth of ∼10 nm [12]. This relatively large bandwidth made it difficult to distribute such photons over a standard single-mode fiber (SMF) with a zero dispersion wavelength of ∼1.3 µm, because of the pulse broadening caused by the large chromatic dispersion of the SMF. Since most installed fibers are standard ...

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“…Conversion of time-bin qubit entanglement to polarization entanglement was previously accomplished in [35] using free space optics. Here we make use of temporal-to-polarization conversion to perform a full quantum state tomography on high-dimensional time-bin entanglement.…”

Section: B Polarization-based Measurementmentioning

confidence: 99%

Tomographic reconstruction of time-bin-entangled qudits

et al. 2016

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We describe an experimental implementation to generate and measure high-dimensional, time-bin entangled qudits. Two-photon time-bin entanglement is generated via spontaneous four-wave mixing in single-mode fiber. Unbalanced Mach-Zehnder interferometers transform selected time-bins to polarization entanglement, allowing standard polarization-projective measurements to be used for complete quantum state tomographic reconstruction. Here, we generate maximally entangled qubits (d = 2), qutrits (d = 3), and ququarts (d = 4), as well as other phase-modulated non-maximally entangled qubits and qutrits. We reconstruct and verify all generated states using maximum likelihood estimation tomography.

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Generation of pulsed polarization-entangled photon pairs in a 155-µm band with a periodically poled lithium niobate waveguide and an orthogonal polarization delay circuit

Cited by 80 publications

References 11 publications

Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock

Generation of1.5−μmband time-bin entanglement using spontaneous fiber four-wave mixing and planar light-wave circuit interferometers

Tomographic reconstruction of time-bin-entangled qudits

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