Tools for Multimode Quantum Information: Modulation, Detection, and Spatial Quantum Correlations

Lassen, Mikael; Delaubert,; Janoušek, Jiří; Wagner, K.; Bachor, Hans‐A.; Lam, Ping Koy; Treps, Nicolas; Buchhave, Preben; Fabre, Claude; Harb, C. C.

doi:10.1103/physrevlett.98.083602

Cited by 103 publications

(59 citation statements)

References 33 publications

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“…It offers the possibility of improving the resolution of an imaging system [3], enhancing image detection [4] or beam positioning [5], and implementing parallel quantum information encoding [6] and processing [7].…”

Section: Introductionmentioning

confidence: 99%

Extracting spatial information from noise measurements of multi-spatial-mode quantum states

et al. 2012

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We show that it is possible to use the spatial quantum correlations present in twin beams to extract information about the shape of a mask in the path of one of the beams. The scheme, based on noise measurements through homodyne detection, is useful in the regime where the number of photons is low enough that direct detection with a photodiode is difficult but high enough that photon counting is not an option. We find that under some conditions the use of quantum states of light leads to an enhancement of the sensitivity in the estimation of the shape of the mask over what can be achieved with a classical state with equivalent properties (mean photon flux and noise properties). In addition, we show that the level of enhancement that is obtained is a result of the quantum correlations and cannot be explained with only classical correlations.

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Section: Introductionmentioning

confidence: 99%

Extracting spatial information from noise measurements of multi-spatial-mode quantum states

et al. 2012

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“…However, we note that our source shares a number of features with sources of non-classical light based on atomic ensembles [10,19]. Our main motivation for the present study was that of possible future applications in multimode quantum information processing [20], particularly involving spatially multimode squeezing which has attracted large attention recently [21][22][23]. We also suppose that our results might be of significance for quantum imaging [11,12,24], especially in applications which require storage of ghost images [25].…”

Section: Introductionmentioning

confidence: 95%

Generation and delayed retrieval of spatially multimode Raman scattering in warm rubidium vapors

Chrapkiewicz¹,

Wasilewski²

2012

Opt. Express

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Abstract:We apply collective Raman scattering to create, store and retrieve spatially multimode light in warm rubidium-87 vapors. The light is created in a spontaneous Stokes scattering process. This is accompanied by the creation of counterpart collective excitations in the atomic ensemble -the spin waves. After a certain storage time we coherently convert the spin waves into the light in deterministic anti-Stokes scattering. The whole process can be regarded as a delayed four-wave mixing which produces pairs of correlated, delayed random images. Storage of higher order spatial modes up to microseconds is possible owing to usage of a buffer gas. We study the performance of the Raman scattering, storage and retrieval of collective excitations focusing on spatial effects and the influence of decoherence caused by diffusion of rubidium atoms in different buffer gases. We quantify the number of modes created and retrieved by analyzing statistical correlations of intensity fluctuations between portions of the light scattered in the far field.

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“…However, CV hyperentanglement has not so far been experimentally explored. Although the applications of CV hyperentanglement have not been discussed extensively, as for the discrete version, this type of entanglement is possible to be used in the multichannel and high-density CV information coding [12] to improve the information capacity. Recently, Coutinho dos Santos et al [13] theoretically predicted CV hyperentanglement in spin angular momentum (SAM) and orbital angular momentum (OAM), which has the potential to be utilized in quantum imaging [14] and quantum metrology to estimate simultaneously the physical parameters more than one, such as spin [15], phase [16], and magnetic field [17].…”

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confidence: 98%

Experimental Generation of Continuous-Variable Hyperentanglement in an Optical Parametric Oscillator

et al. 2014

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We report on the generation of continuous-variable hyperentanglement of polarization and orbital angular momentum with a type II optical parametric oscillator. By compensating for the astigmatism between spatial modes, we produce an entangled pair of Hermite-Gauss beams. From correlations measurements, we verify the existence of continuous-variable hyperentanglement by the general entanglement criterion as well as by the continuous-variable version of the Peres-Horodecki criterion visualized on an equivalent Poincaré sphere.

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Tools for Multimode Quantum Information: Modulation, Detection, and Spatial Quantum Correlations

Cited by 103 publications

References 33 publications

Extracting spatial information from noise measurements of multi-spatial-mode quantum states

Extracting spatial information from noise measurements of multi-spatial-mode quantum states

Generation and delayed retrieval of spatially multimode Raman scattering in warm rubidium vapors

Experimental Generation of Continuous-Variable Hyperentanglement in an Optical Parametric Oscillator

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