Experimental realization of sub-shot-noise quantum imaging

Brida, G.; Genovese, M.; Berchera, I. Ruo

doi:10.1038/nphoton.2010.29

Cited by 678 publications

(614 citation statements)

References 41 publications

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“…The homogeneous, multimode OPO was shown to present squeezing, entanglement, and twin-beam correlations between spatial modes below threshold [40][41][42] and above threshold in the presence of stable patterns or even frozen chaos [39,43]. Similar effects have been predicted in Kerr media [44] and in second-harmonic generation [45], and in recent years there have been several successful experimental realizations [13][14][15][16][46][47][48][49]. The effects of a spatial modulation discussed here for an OPO can also be generalized to these other nonlinear devices modified by the inclusion of an intracavity PC.…”

Section: Introductionmentioning

confidence: 80%

“…Recently, special attention has been devoted also to spatial degrees of freedom where quantum correlations are displayed between cavity modes or parts of light beams [11]. Indeed, many applications have been already realized with multimode light, such as optical switching [12], quantum imaging [13][14][15][16], metrology [17], and quantum information [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Spatial fluctuations in an optical parametric oscillator below threshold with an intracavity photonic crystal

2012

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Original citationGarcia We show how to control spatial quantum correlations in a multimode, degenerate, type-I optical parametric oscillator below threshold by introducing a spatially inhomogeneous medium, such as a photonic crystal, in the plane perpendicular to light propagation. We obtain the analytical expressions for all of the correlations in terms of the relevant parameters of the problem and study the number of photons, entanglement, squeezing, and twin beams. Considering different regimes and configurations, we show that it is possible to tune the instability thresholds as well as the quantumness of correlations by breaking the translational invariance of the system through a photonic-crystal modulation.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Spatial fluctuations in an optical parametric oscillator below threshold with an intracavity photonic crystal

2012

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“…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]. In this paper, we propose the multimode CV QKD taking fully into account the intrinsic multimode structure of sources, channels, and detectors.…”

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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“…By employing a low-loss mode conversion [36], we plan to couple our device to single mode fibers, delivering convenient sources of nonclassical light for various applications such as quantum key distribution [7,37,38], ultra-sensitive detection, imaging, and spectroscopy [39]. Our approach based on planar antennas is also applicable to other solid-state quantum emitters with high quantum efficiency.…”

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confidence: 99%

A single molecule as a high-fidelity photon gun for producing intensity-squeezed light

2016

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A two-level atom cannot emit more than one photon at a time. As early as the 1980s, this quantum feature was identified as a gateway to "single-photon sources", where a regular excitation sequence would create a stream of light particles with photon number fluctuations below the shot noise [1]. Such an intensity squeezed beam of light would be desirable for a range of applications such as quantum imaging, sensing, enhanced precision measurements and information processing [2,3]. However, experimental realizations of these sources have been hindered by large losses caused by low photon collection efficiencies and photophysical shortcomings. By using a planar metallo-dielectric antenna applied to an organic molecule, we demonstrate the most regular stream of single photons reported to date. Measured intensity fluctuations reveal 2.2 dB squeezing limited by our detection efficiency, equivalent to 6.2 dB intensity squeezing right after the antenna.Single-photon sources (SPS) have attracted a great deal of attention in the past two decades. One of the common methods for generating single photons is based on parametric down conversion in nonlinear materials, whereby a pair of photons are produced and separated using spectral, spatial, or polarization filters. Advantages of this approach are its large wavelength tunability and the possibility to herald the detection of one photon by the other one of the pair. However, the emission statistics in this method remains Poissonian, and it cannot produce single photons on demand.To exclude the generation of two simultaneous photons, and more importantly, to achieve deterministic production of single photons at a given time, the antibunched radiation of an isolated quantum emitter offers the best choice [4][5][6]. However, so far random losses in the emission, collection, and detection processes have made it impossible to register one single photon at a particular time [7], so that the common terminologies of "single-photon" source or photon "gun" used in the literature greatly fall short of their expectations.Three sources of loss have to be controlled. First, photophysical losses caused by a non-unity quantum efficiency (e.g. for color centers [8]) or unforseeable transitions to dark states (e.g. in colloidal quantum dots [9]) spoil a deterministic emission. Second, it is a great challenge to collect all the photons, which are usually emitted in a nearly isotropic fashion. Third, the quantum efficiency of the detectors and losses in the optical path limit the final performance. Here, we present a substantial progress in remedying these issues by using single organic molecules with very high quantum efficiency as emitter, optimizing the excitation pulse scheme, careful choice of the optical elements, and employing a new design of metallo-dielectric antennas [10, 11].1 arXiv:1608.07980v1 [quant-ph]

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Experimental realization of sub-shot-noise quantum imaging

Cited by 678 publications

References 41 publications

Spatial fluctuations in an optical parametric oscillator below threshold with an intracavity photonic crystal

Spatial fluctuations in an optical parametric oscillator below threshold with an intracavity photonic crystal

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

A single molecule as a high-fidelity photon gun for producing intensity-squeezed light

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