Turn-key diode-pumped all-fiber broadband polarization-entangled photon source

Chen, Changjia; Riazi, Arash; Zhu, Eric Y.; Ng, Mili; Gladyshev, Alexey V.; Kazansky, Peter G.; Qian, Li

doi:10.1364/osac.1.000981

Cited by 21 publications

(13 citation statements)

References 34 publications

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“…On the service provider’s side, the number of wavelength channels can be increased drastically by using closer-spaced, narrower-band WDMs and by generating broader-band down-conversion. For example, periodically poled fibers are a very promising method of the latter ( 30 ). Using polarization preserving methods of multiplexing, such as an on-chip design, would eliminate the need for most FPCs.…”

Section: Discussionmentioning

confidence: 99%

A trusted node–free eight-user metropolitan quantum communication network

et al. 2020

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Quantum communication is rapidly gaining popularity due to its high security and technological maturity. However, most implementations are limited to just two communicating parties (users). Quantum communication networks aim to connect a multitude of users. Here, we present a fully connected quantum communication network on a city-wide scale without active switching or trusted nodes. We demonstrate simultaneous and secure connections between all 28 pairings of eight users. Our novel network topology is easily scalable to many users, allows traffic management features, and minimizes the infrastructure as well as the user hardware needed.

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Section: Discussionmentioning

confidence: 99%

A trusted node–free eight-user metropolitan quantum communication network

et al. 2020

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“…We have now all the equations needed to predict the evolutions of the optical fields for SFG or DFG, by replacing the expressions for the polarization, Eq. (17)(18)(19)(20) in the expressions for the efficiencies, Eq. (13-15), and solving the set of coupled-wave equations, Eq.…”

Section: Surface Nonlinear Polarizationmentioning

confidence: 99%

“…The problem is that silica is a centrosymmetric material that does not present naturally such a second-order nonlinearity in its bulk state. This problem had been solved using periodical poling of silica fibers [17,18] but that solution requires complex process to make the fiber nonlinear and to achieve phase matching and may encounter some stability problem over time.…”

Section: Introductionmentioning

confidence: 99%

Modeling photon pair generation by second-order surface nonlinearity in silica nanofibers

Azzoune¹,

Delaye

Pauliat

2021

J. Opt. Soc. Am. B

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In this paper, we present a design of an all-fiber source of correlated photon pairs based on standard telecommunications tapered fibers. We examine the generation of correlated photon pairs using parametric process (") in silica tapered optical fibers. This nonlinear process is ensured thanks to surface dipole and bulk multipole nonlinearities. The process of photons creation is modeled by taking into account the vector aspect of the propagation of the optical field in a silica nanofiber. The phase matching is provided by propagating the pump field in one spatial mode, while generating a photon pair in another spatial mode. The generation efficiency of photon pairs depends on diameter uniformity of the nanofiber after the manufacturing process. We size this nanofiber for a good optimization of photon pair generation efficiency, we report that the tolerance in diameter uniformity is = 2 nm for a generation rate of photon pairs estimated to $% ≈ 22 000 pairs/s, for 1 W power pump and a nanofiber length of 1.1 mm. Deposits on the nanofiber can be used in order to relax the manufacturing constraints on diameter to maximize the generation rate of photon pairs. As an example, the use of Polytetrafluoroethylene (PTFE) on the nanofiber applied as a cladding whose thickness is infinite makes it possible to relax the constraints on the nanofiber diameter. For the same = 2 nm, a generation rate of photon pairs estimated to $% ≈ 78 000 pairs/s for 1 W power pump and a nanofiber length of 2.4 mm is predicted.

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“…A PPSF is used for entanglement generation via type-II SPDC, in which a vertically polarized pump photon is down-converted to a pair of H-and V-polarized photons [35]. The fast axis of PMF is aligned to PPSF's V direction(inset of Fig.3a) [36]. Owing to the PPSF's low group birefringence nature, it can offer high quality direct generation of entangled photons states Eqn.…”

Section: The Deterministic Separation Of Two Photons By Interference mentioning

confidence: 99%

“…The fast axis of PMF is aligned to PPSF's V direction(inset of Fig. 3a) [36]. Owing to the PPSF's low group birefringence nature, it can offer high quality direct generation of entangled photons states Eqn.…”

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confidence: 99%

Recovering the full dimensionality of hyperentanglement in collinear photon pairs

et al. 2020

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Exploiting hyperentanglement of photon pairs, that is, simultaneous entanglement in multiple degrees of freedom(DOFs), increases the dimensionality of Hilbert spaces for quantum information processing. However, generation of hyperentangled photon pairs collinearlly, while produces high brightness, results in a smaller Hilbert space due to the two photons being in the same spatial mode. In this letter, we point out that one can recover the full dimensionality of such hyperentanglement through a simple interference set up, similar to the time-reversed Hong-Ou-Mandel (TR-HOM) process. Different from the standard TR-HOM, we point out a critical phase condition has to be satisfied in order to recover the hyperentanglement. We theoretically analyze the realization of this approach and discuss the feasibility of generating truly hyperentangled photon pairs. Our proposed approach does not require post-selection and hence enables efficient hyper-entangled photon pairs generation for high-dimensional quantum applications.Entangled photons play a critical role in many applications of quantum opticshorodecki2009quantum. Photons that are simultaneously entangled in more than one degree of freedom(DOF), the so-called 'hyperentangled' states, have attracted much recent interest [1][2][3]. Hyperentanglement expands the dimensionality of the Hilbert space of biphotons, enables complete Bell state analysis [4,5], increases the information capacity per pair photons [6,7] and therefore lays the fundation of superdense-coding quantum communication [8][9][10]. It has also become the key technology for certain tests of fundamental physics [11,12].The generation of entangled photons is most conveniently done in a nonlinear medium. When the phase matching can be satisfied over a bandwidth much greater than the pump bandwidth, the photons are frequency entangled as a result of energy conservation. Entanglement in another DOF can be arranged through various means, such as type II phase matching for polarizationentanglement[13], delayed interferometer for time-bin entanglement [14], or simultaneous phase matching for various orbital angular momentum modes [15]. Here, we consider hyper-entanglement in frequency and polarization DOFs, as frequency and polarization of photons are robust over large transmission distances in optical fibre. Entanglement in these two DOFs can also be generated relatively straightforwardly in fibre [16] and nonlinear waveguides [17]. While collinear photon pair generation in a fibre or a nonlinear waveguide is most efficient due to large nonlinear interaction length and no spatial filtering required (as opposed to non-collinear generation [18]), we will show that that collinear entangled photon pairs have a reduced dimensionality in Hilbert space.By "hyperentanglement", we mean not only the photons are entangled in both DOFs, but also that they are accessible individually, e.g. the hyperentangled photons are spatially separated. In collinear parametric processes such as type-II spontaneous parametric downconversion...

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Turn-key diode-pumped all-fiber broadband polarization-entangled photon source

Cited by 21 publications

References 34 publications

A trusted node–free eight-user metropolitan quantum communication network

A trusted node–free eight-user metropolitan quantum communication network

Modeling photon pair generation by second-order surface nonlinearity in silica nanofibers

Recovering the full dimensionality of hyperentanglement in collinear photon pairs

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