Superbunched bright squeezed vacuum state

Iskhakov, T. Sh.; Pérez, A. M.; Spasibko, Kirill Yu.; Chekhova, Maria V.; Leuchs, Gerd

doi:10.1364/ol.37.001919

Cited by 90 publications

(38 citation statements)

References 16 publications

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“…At the other end where |r| 2 ∼ 0, we clearly find coherence properties close to the ones of the input state |α . A significant feature in the curve is the presence of a peak centered around |r| 2 = 0.6, which attains a measured value of g (2) (0) = 2.5 ± 0.23, above the limit of thermal states, which has been termed superbunching [37]. While this is not a signature of nonclassicality per se (in principle, any value can be achieved by a mixture of coherent states), we can still make inferences of nonclassical features by observing the corresponding statistics measured in Fig.…”

Section: Experimental Tuning Of the Second-order Coherencementioning

confidence: 99%

Multiphoton state engineering by heralded interference between single photons and coherent states

et al. 2012

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We develop a technique for generating multiphoton nonclassical states via interference between coherent and Fock states using quantum catalysis. By modulating the coherent field strength, the number of catalyst photons, and the ratio of the beam splitter upon which they interfere, a wide range of nonclassical phenomena can be created, including squeezing of up to 1.25 dB, antibunched and superbunched photon statistics, and states exhibiting over 90% fidelity to displaced coherent superposition states. We perform quantum catalysis experimentally, showing tunability into the nonclassical regime. Our protocol is not limited by weak nonlinearities that underlie most known strategies of preparing multiphoton nonclassical states. Successive iterations of this protocol can lead to direct control over the weights of higher-order terms in the Fock basis, paving the way towards conditional preparation of "designer" multiphoton states for applications in quantum computation, communication, and metrology.

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Section: Experimental Tuning Of the Second-order Coherencementioning

confidence: 99%

Multiphoton state engineering by heralded interference between single photons and coherent states

et al. 2012

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“…Additionally, the pump has a beam size of FWHM 300 ± 10 µm in the first pass and, to provide a higher parametric gain, 180 ± 10 µm in the second pass. From the nonlinear dependence of the PDC intensity on the pump power, I(P) ∝ sinh 2 G, G ∝ √ P, we measure the gain G [22]. We obtain separately the gain from the first pass G 1 = 2.1 ± 0.3 and from the second pass G 2 = 3.3 ± 0.3.…”

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confidence: 99%

Wide-field SU(1,1) interferometer

Frascella

Михайлов

Takanashi

et al. 2019

Optica

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An SU(1, 1) interferometer uses a sequence of two optical parametric amplifiers for achieving subshot-noise sensitivity to a phase shift introduced in between. We present the first realization of a wide-field SU(1, 1) interferometer, where the use of a focusing element enables spatially multimode operation within a broad angle. Over this angle, the interference phase is found to be flat. This property is important for the high sensitivity to the phase front disturbance. Further, −4.3 ± 0.7 dB quadrature squeezing, an essential requirement to the high sensitivity, is experimentally demonstrated for plane-wave modes inside the interferometer. Such an interferometer is useful not only for quantum metrology, but also in remote sensing, enhanced sub-shot-noise imaging, and quantum information processing.Interferometers have been used for more than a century to measure physical quantities with high accuracy. Recently, the experimental realization of SU(1, 1) interferometers has raised significant interest due to the loss-tolerant sub-shot-noise sensitivity [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The core idea is to use a series of two optical parametric amplifiers (OPAs) to probe phase shifts between them [15,16]. Possible applications are in remote sensing [11] and in quantum information processing [14], but such a scheme is especially attractive for quantum metrology with optical [2,7,9], atom [5,17] and hybrid [18] interferometers.The two-mode squeezed state employed in an SU(1, 1) interferometer is a quantum resource that helps to overcome the Letter Vol. X, No. X / April 2016 / Optica 4

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“…It is well known that a single mode of the PDC signal or idler radiation has thermal statistics, i.e. g (2) 0 = 2 [25][26][27], and in the multi-mode case g (2) m = 1 + g (2) 0 −1 m [28]. Thus, from the measured g (2) m we calculated the number of modes m in the signal and idler beams.…”

Section: Methodsmentioning

confidence: 99%

Interference of macroscopic beams on a beam splitter: phase uncertainty converted into photon-number uncertainty

et al. 2014

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Squeezed-vacuum twin beams, commonly generated through parametric downconversion, are known to have perfect photon-number correlations. According to the Heisenberg principle, this is accompanied by a huge uncertainty in their relative phase. By overlapping bright twin beams on a beam splitter, we convert phase fluctuations into photon-number fluctuations and observe this uncertainty as a typical 'U-shape' of the output photon-number distribution. This effect, although reported for atomic ensembles and giving hope for phase super-resolution, has never been observed for light beams. The shape of the normalized photon-number difference distribution is similar to the one that 7 These two authors contributed equally.

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Superbunched bright squeezed vacuum state

Cited by 90 publications

References 16 publications

Multiphoton state engineering by heralded interference between single photons and coherent states

Multiphoton state engineering by heralded interference between single photons and coherent states

Wide-field SU(1,1) interferometer

Interference of macroscopic beams on a beam splitter: phase uncertainty converted into photon-number uncertainty

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