Photon-number distributions of twin beams generated in spontaneous parametric down-conversion and measured by an intensified CCD camera

Peřina, Jan; Hamar, Martin; Michálek, Václav; Haderka, Ondřej

doi:10.1103/physreva.85.023816

Cited by 73 publications

(88 citation statements)

References 49 publications

(88 reference statements)

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“…Entropies of the single-mode noise fields are given by Eq. (33). Equation (33) is applicable also for determination of the entropy of entanglement of a single-mode paired field in a pure state for whichρ s,jj ← c 2 j .…”

Section: Experimental Multimode Twin Beamsmentioning

confidence: 99%

“…It is based upon the measurement of the joint signal-idler photocount histogram using photon-number-resolving detectors. Knowing these detector parameters [33], reconstruction of the joint signal-idler photon-number distribution [8,34] provides the applied mean photon(-pair) numbers B and numbers M of modes. The above-derived formulas then give the discussed quantities.…”

Section: Experimental Multimode Twin Beamsmentioning

confidence: 99%

“…Alternatively, several operational criteria for nonclassicality of either single-mode [25][26][27] or multimode [28][29][30] fields have been revealed. Their derivations are based either on field's moments [28,30,31] or on direct reconstruction of quasidistributions of integrated intensities [32][33][34]. Also, criteria derived from the majorization theory have been found [35,36].…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of nonclassicality, entanglement, and dimensionality of multimode noisy twin beams

2015

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The nonclassicality, entanglement, and dimensionality of a noisy twin beam are determined using a characteristic function of the beam written in the Fock basis. One-to-one correspondence between the negativity quantifying entanglement and the nonclassicality depth is revealed. Twin beams, which are either entangled or nonclassical (independent of their entanglement), are observed only for the limited degrees of noise, which degrades their quantumness. The dimensionality of the twin beam quantified by the participation ratio is compared with the dimensionality of entanglement determined from the negativity. Partitioning of the degrees of freedom of the twin beam into those related to entanglement and to noise is suggested. Both single-mode and multimode twin beams are analyzed. Weak nonclassicality based on integrated-intensity quasidistributions of multimode twin beams is studied. The relation of the model to the experimental twin beams is discussed.

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Section: Experimental Multimode Twin Beamsmentioning

confidence: 99%

Section: Experimental Multimode Twin Beamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative study of nonclassicality, entanglement, and dimensionality of multimode noisy twin beams

2015

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“…Surprisingly, EPR correlations can be directly observed in this system [22][23][24][25][26]. Moreover, a reconstruction of the state together with its nonclassical features has been done using CCD image sensors [27][28][29][30]. Another kind of photon number resolving detectors is based on superconducting systems, cf.…”

Section: Introductionmentioning

confidence: 99%

Correlation measurements with on-off detectors

Sperling¹,

Vogel²,

Agarwal³

2013

Phys. Rev. A

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We present a general method to detect nonclassical radiation fields with systems of on-off detectors. We especially study higher order correlations for the identification of nonclassical radiation. This allows us to directly characterize quantum correlations by the statistics measured with systems of on-off detectors. Additionally, we generalize our method to multiple detector systems for measurements of correlations between light fields. We also consider multi-mode radiation fields and isolate nonclassicality in terms of the space time correlations. Finally, we present results for the quantum statistics using on-off detectors operating in nonlinear detection modes.

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“…The single mode approximation is therefore only a very strict assumption used in all the security analysis of continuousvariable QKD and an impact on the multimode structure on the security of CV QKD has not been analyzed yet, although it was studied for discrete-variable QKD [31]. In addition, the recently generated bright and heavily multimode entangled beams [32][33][34][35][36][37] could have a potential to be positively used in the semiclassical CV QKD to improve or stabilize its security. It is also suggested by their recent successful use in quantum imaging [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Entanglement-based continuous-variable quantum key distribution with multimode states and detectors

2014

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Secure quantum key distribution with multimode Gaussian entangled states and multimode homodyne detectors is proposed. In general the multimode character of both the sources of entanglement and the homodyne detectors can cause a security break even for a perfect channel when trusted parties are unaware of the detection structure. Taking into account the multimode structure and potential leakage of information from a homodyne detector reduces the loss of security to some extent. We suggest the symmetrization of the multimode sources of entanglement as an efficient method allowing us to fully recover the security irrespectively to multimode structure of the homodyne detectors. Further, we demonstrate that by increasing the number of the fluctuating but similar source modes the multimode protocol stabilizes the security of the quantum key distribution. The result opens the pathway towards quantum key distribution with multimode sources and detectors.

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Photon-number distributions of twin beams generated in spontaneous parametric down-conversion and measured by an intensified CCD camera

Cited by 73 publications

References 49 publications

Comparative study of nonclassicality, entanglement, and dimensionality of multimode noisy twin beams

Comparative study of nonclassicality, entanglement, and dimensionality of multimode noisy twin beams

Correlation measurements with on-off detectors

Entanglement-based continuous-variable quantum key distribution with multimode states and detectors

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