A pulsed source of continuous variable polarization entanglement

Glöckl, O.; Heersink, J.; Korolkova, Natalia; Leuchs, Gerd; Lorenz, Stefan

doi:10.1088/1464-4266/5/4/355

Cited by 22 publications

(15 citation statements)

References 21 publications

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“…We expect statistically identical output beams C and D and the correlations in both conjugate variables should be equal. This is in contrast to our previous resource efficient experiment using only one polarisation squeezed input [14].…”

Section: Polarisation Entanglementcontrasting

confidence: 59%

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An efficient source of continuous variable polarization entanglement

Dong

Heersink

Yoshikawa

et al. 2007

Quantum-Atom Optics Downunder

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We have experimentally demonstrated the efficient creation of highly entangled bipartite continuous variable polarisation states. Exploiting an optimised scheme for the production of squeezing using the Kerr non-linearity of a glass fibre we generated polarisation squeezed pulses with a mean classical excitation inŜ 3 . Polarisation entanglement was generated by interfering two independent polarisation squeezed fields on a symmetric beam splitter. The resultant beams exhibit strong quantum noise correlations in the darkŜ 1 −Ŝ 2 polarisation plane. To verify entanglement generation, we characterised the quantum correlations of the system for two different sets of conjugate Stokes parameters. The quantum correlations along the squeezed and the anti-squeezed Stokes parameters were observed to be -4.1±0.3 dB and -2.6±0.3 dB below the shot noise level respectively. The degree of correlations was found to depend critically on the beam splitting ratio of the entangling beam splitter. Carrying out measurements on a different set of conjugate Stokes parameters, correlations of -3.6±0.3 dB and -3.4±0.3 dB have been observed. This result is more robust against asymmetries in the entangling beam splitter, even in the presence of excess noise.

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Section: Polarisation Entanglementcontrasting

confidence: 59%

“…A further solution was demonstrated in Ref. [14] where a single polarisation squeezed input was used for the entanglement creation. In this paper we build upon the latter methods and use two polarisation squeezed input states to generate polarisation entanglement.…”

Section: Introductionmentioning

confidence: 99%

An efficient source of continuous variable polarization entanglement

Dong

Heersink

Yoshikawa

et al. 2007

Quantum-Atom Optics Downunder

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“…As a result of this parsing, the squeezing of the state can be much smaller than the corresponding squeezing in the individual Fock layers [137]. Polarization squeezing has been observed in numerous experiments [138][139][140][141][142][143][144][145][146]. The Kerr effect in fibers is probably one of the most efficient and will be discussed with more detail below in Sec.…”

Section: Uncertainty Relations and Polarization Squeezingmentioning

confidence: 96%

Quantum concepts in optical polarization

et al. 2021

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We comprehensively review the quantum theory of the polarization properties of light. In classical optics, these traits are characterized by the Stokes parameters, which can be geometrically interpreted using the Poincaré sphere. Remarkably, these Stokes parameters can also be applied to the quantum world, but then important differences emerge: now, because fluctuations in the number of photons are unavoidable, one is forced to work in the three-dimensional Poincaré space that can be regarded as a set of nested spheres. Additionally, higher-order moments of the Stokes variables might play a substantial role for quantum states, which is not the case for most classical Gaussian states. This brings about important differences between these two worlds that we review in detail. In particular, the classical degree of polarization produces unsatisfactory results in the quantum domain. We compare alternative quantum degrees and put forth that they order various states differently. Finally, intrinsically nonclassical states are explored and their potential applications in quantum technologies are discussed.

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“…by using radio-frequency spectrum analysers), rather than in the time domain. As a consequence, even if they are actually pulsed [19,20], such experiments cannot be easily used to implement quantum communication protocols, because they do not provide access to each individual entangled pulse. These difficulties might be solved by developing a quantum theory of analog modulation, evaluating the information transfer by defining appropriate time-bandwidth limited modes, and quantizing them.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved homodyne characterization of individual quadrature-entangled pulses

et al. 2004

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We describe a simple and efficient setup to generate and characterize femtosecond quadratureentangled pulses. Quantum correlations equivalent to about 2.5 dB squeezing are efficiently and easily reached using the non-degenerate parametric amplification of femtosecond pulses through a single-pass in a thin (100 µm) potassium niobate crystal. The entangled pulses are then individually sampled to characterize the non-separability and the entropy of formation of the states. The complete experiment is analysed in the time-domain, from the pulsed source of quadrature entanglement to the time-resolved homodyne detection. This particularity allows for applications in quantum communication protocols using continuous-variable entanglement.

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A pulsed source of continuous variable polarization entanglement

Cited by 22 publications

References 21 publications

An efficient source of continuous variable polarization entanglement

An efficient source of continuous variable polarization entanglement

Quantum concepts in optical polarization

Time-resolved homodyne characterization of individual quadrature-entangled pulses

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