Quantum hologram of macroscopically entangled light via the mechanism of diffuse light storage

Gerasimov, L. V.; Sokolov, I. M.; Kupriyanov, D. V.; Havey, M. D.

doi:10.1088/0953-4075/45/12/124012

Cited by 8 publications

(8 citation statements)

References 45 publications

(73 reference statements)

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“…The latter is a macroscopic analog of two-photon polarization Bell states [8]. Since these states combine quantum properties with macroscopic population and could enable efficient light-matter coupling, they are interesting for quantum information technology: quantum memory [9][10][11], quantum key distribution [12], quantum metrology [13,14], and macroscopic Bell tests [15,16]. However, their distinguishability is low in analog detection and they are easily destroyed by losses [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum superpositions

et al. 2012

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We discuss a device capable of filtering out two-mode states of light with mode populations differing by more than a certain threshold, while not revealing which mode is more populated. It would allow engineering of macroscopic quantum states of light in a way which is preserving specific superpositions. As a result, it would enhance optical phase estimation with these states as well as distinguishability of "macroscopic" qubits. We propose an optical scheme, which is a relatively simple, albeit nonideal, operational implementation of such a filter. It uses tapping of the original polarization two-mode field, with a polarization-neutral beam splitter of low reflectivity. Next, the reflected beams are suitably interfered on a polarizing beam splitter. It is oriented such that it selects unbiased polarization modes with respect to the original ones. The more an incoming two-mode Fock state is unequally populated, the more the polarizing beam-splitter output modes are equally populated. This effect is especially pronounced for highly populated states. Additionally, for such states we expect strong population correlations between the original fields and the tapped one. Thus, after a photon-number measurement of the polarizing beam-splitter outputs, a feed-forward loop can be used to let through a shutter the field, which was transmitted by the tapping beam splitter. This happens only if the counts at the outputs are roughly equal. In such a case, the transmitted field differs strongly in occupation number of the two modes, while information on which mode is more populated is nonexistent (a necessary condition for preserving superpositions).

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Section: Introductionmentioning

confidence: 99%

Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum superpositions

et al. 2012

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“…The possibility to involve such bright states in interactions with material quantum objects (atoms, molecules, quantum dots) has been also addressed. Also the application of twin beams to quantum memories has been recently suggested [29].In this paper, we present a joint investigation of spatial and spectral features of twin-beam states produced in the high-gain regime with non-negligible pump depletion. The coherence properties at different values of pump mean power are inferred by evaluating the intensity auto-and cross-correlation functions on single-shot images of the far-field (θ, λ) speckle-like pattern of the PDC radiation.…”

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confidence: 99%

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confidence: 99%

Coherence properties of high-gain twin beams

et al. 2014

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Twin-beam coherence properties are analyzed both in the spatial and spectral domains at high-gain regime including pump depletion. The increase of the size of intensity auto-and cross-correlation areas at increasing pump power is replaced by a decrease in the pump depletion regime. This effect is interpreted as a progressive loss in the mode selection occurring at high-gain amplification. The experimental determination of the number of spatio-spectral modes from g (2) -function measurements confirms this explanation. The process of parametric down-conversion (PDC) in bulk nonlinear crystals generates twin-beam states of light that are naturally multi-mode both in spectrum and space [1]. Many works, performed in the single-photon regime, have highlighted the correlations and coherence properties of photon pairs either in spectrum or space [2][3][4][5][6][7][8][9]. In the past ten years, also high-gain PDC, leading to a large number of photons per mode, has been the object of several studies for its interesting properties of subshot-noise spatial intensity correlations [10][11][12][13] and macroscopic entanglement [14][15][16][17][18][19]. More recently, the spectral features of macroscopic twin-beam states have been investigated in the collinear interaction geometry close to frequency degeneracy [20]. Moreover, in the high-gain regime, the X-shaped coherence of the PDC output field [21] and the X-shaped spatio-temporal twin beam near-field correlations [22][23][24], originating from the space-time coupling in the phase-matching, have been demonstrated. The high-gain PDC process is also in the focus of attention for its potential applications. For instance, high-gain PDC has been used for quantum imaging [25], ghost imaging [26], and absolute calibration of photo-detectors [27,28]. The possibility to involve such bright states in interactions with material quantum objects (atoms, molecules, quantum dots) has been also addressed. Also the application of twin beams to quantum memories has been recently suggested [29].In this paper, we present a joint investigation of spatial and spectral features of twin-beam states produced in the high-gain regime with non-negligible pump depletion. The coherence properties at different values of pump mean power are inferred by evaluating the intensity auto-and cross-correlation functions on single-shot images of the far-field (θ, λ) speckle-like pattern of the PDC radiation. The initial increase with PDC gain of the size of coherence areas, both in spectrum and space, gradually stops and, at a certain pump power, is replaced by a decrease. This behavior is due to the occurrence of a progressive pump depletion, which is testified by the evolution of the spatial and spectral pump beam profiles. A possible explanation can be given in terms of the varying population of Schmidt paired modes [30] that 'diagonalize' the nonlinear interaction. The number of effectively populated modes is experimentally accessed by the measurement of spatio-spectral intensity g (2) -correlation function. T...

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“…At the same time, because BSV can have huge numbers of photons per mode, it can be easily involved into nonlinear optical interactions [2] and interactions with material quantum objects such as atoms, molecules, quantum dots etc. In particular, its application to quantum memory is discussed [3]. Recently, BSV has been used for quantum imaging [4] and absolute calibration of photodetectors [5].…”

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confidence: 99%

Spectral properties of high-gain parametric down-conversion

Spasibko¹,

Iskhakov²,

Chekhova³

2012

Opt. Express

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High-gain parametric down-conversion (PDC) is a source of bright squeezed vacuum, which is a macroscopic nonclassical state of light and a promising candidate for quantum information applications. Here we study its properties, such as the intensity spectral width and the spectral width of pairwise correlations. In agreement with the theory, we observe an increase in the spectral width by 27% compared with the low-gain PDC. Frequency cross- and auto-correlations are registered by measuring the reduction of noise in the difference of PDC intensities at various pairs of wavelengths. The noise reduction plots also demonstrate super-bunching typical for collinear frequency-degenerate PDC.

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Quantum hologram of macroscopically entangled light via the mechanism of diffuse light storage

Cited by 8 publications

References 45 publications

Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum superpositions

Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum superpositions

Coherence properties of high-gain twin beams

Spectral properties of high-gain parametric down-conversion

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