Observing the nonclassical nature of ultra-broadband bi-photons at ultrafast speed

Shaked, Yaakov; Pomerantz, Roey; Vered, Rafi Z.; Pe'er, Avi

doi:10.1088/1367-2630/16/5/053012

Cited by 34 publications

(28 citation statements)

References 37 publications

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“…We measured experimentally the bi-photon spectral phase with the non-classical interference effect presented in [8], which is capable of measuring the bi-photon spectral phase and amplitude even in the presence of spectral modulation. The SPDC that was generated in one nonlinear crystal propagated together with the pump laser into a second identical crystal, where SPDC can be either enhanced or diminished.…”

Section: Methodsmentioning

confidence: 99%

“…Another approach is to choose a generation wavelength that allows compensation of the entire bandwidth by a single phase-matching condition, which is possible when the central bi-photon frequency is matched to the zero dispersion of the nonlinear medium. Ultra-broad phase matching of the nonlinear down-conversion interaction, has been widely discussed [4][5][6][7][8][9][10]. In [6,9,10] for example, the broad bandwidth is achieved by chirping the quasi-phase matching period along the crystal.…”

Section: Introductionmentioning

confidence: 99%

“…In [6,9,10] for example, the broad bandwidth is achieved by chirping the quasi-phase matching period along the crystal. We have recently demonstrated generation of near-octave, ultra-broad bi-photons using type-I down-conversion near the zero-dispersion frequency of the nonlinear crystal [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Here, we describe and demonstrate compensation of the bi-photon spectral phase to 20 π < across a bandwidth of 110 > THz (nearly an octave), using a Brewster prism-pair [19] with an effectively negative separation that allows simultaneous compensation of two dispersion orders: second (GDD) and fourth (fourthorder dispersion, FOD). As feedback for tuning the compensation we exploit a pairwise interference effect [8] that can measure the bi-photon spectral phase even when the dispersion is totally uncompensated. This interference measure provides clear verification of the compensation accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Octave-spanning spectral phase control for single-cycle bi-photons

et al. 2015

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The quantum correlation of octave-spanning time-energy entangled bi-photons can be as short as a single optical cycle. Many experiments designed to explore and exploit this correlation require a uniform spectral phase (transform-limited) with very low loss. So far, transform-limited single-cycle bi-photons have not been demonstrated, primarily due to the lack of precise, broadband control of their spectral phase. Here, we demonstrate the correction of the spectral-phase of near-octave spanning bi-photons to 20 φ π < over an octave in frequency 1330 ≈ -2600 nm). Using a prism-pair with an effectively negative separation for shaping the bi-photons' spectral phase, we obtain a tuned, very low-loss compensation of both the second and fourth dispersion orders. An essential requisite for precise tuning over such a broad bandwidth is a measure of the spectral phase that provides feedback for the tuning even when the overall dispersion is far from compensated. This is achieved by a nonclassical bi-photon interference, which enables direct verification of the corrected bi-photon spectral phase.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Octave-spanning spectral phase control for single-cycle bi-photons

et al. 2015

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“…1(b)] resembles the so-called SU(1,1) interferometer [24] often used for low-noise phase measurements [13]. However, due to the high-gain nature of the parametric process [25], the number of photons per frequency mode in this regime is much larger; however, the two parametric down-converted beams from each nonlinear medium still interfere [26,27], resulting in spectral fringes (analogous to the spontaneous regime) that can be detected classically at the output of the interferometer.…”

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confidence: 99%

Alignment-free dispersion measurement with interfering biphotons

et al. 2019

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Measuring the dispersion of photonic devices with small dispersion-length products is challenging due to the phase-sensitive, and alignment-intensive nature of conventional methods. In this letter, we demonstrate a quantum technique to extract the second-, and third-order chromatic dispersion of a short single-mode fiber using a fiber-based quantum nonlinear interferometer. The interferometer consists of two cascaded fiber-based biphoton sources, with each source acting as a nonlinear beamsplitter. A fiber under test is placed in between these two sources, and introduces a frequency-dependent phase that is imprinted upon the biphoton spectrum (interferogram) at the output of the interferometer. This interferogram contains within it the dispersion properties of the test fiber. Our technique has three novel features: (1) The broadband nature of the biphoton sources used in our setup allows accurate dispersion measurements on test devices with small dispersionlength products; (2) our all-fiber common-path interferometer requires no beam alignment or phase stabilization; (3) multiple phase-matching processes supported in our biphoton sources enables dispersion measurements at different wavelengths, which yields the third-order dispersion, achieved for the first time using a quantum optical technique.Chromatic dispersion is an important physical property that affects the propagation of optical pulses in photonic systems; in linear systems it is used for pulse shaping [1], while in nonlinear systems it plays an important role in soliton propagation, and affects the efficiency of many nonlinear interactions [2]. Dispersion characterization is then crucial for designing optimized photonic devices. Significant effort has been expended in past decades on extracting the chromatic dispersion of materials using classical light sources. Techniques such as time-of-flight [3], and modulation phase shift [4] were introduced to measure the dispersion of components with large dispersion-length products. Components with small dispersion-length products were characterized with temporal [5], and spectral [6] white-light interferometry (WLI), with the latter proving to be the more robust method against environmental noise [7].

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Observing the nonclassical nature of ultra-broadband bi-photons at ultrafast speed

Cited by 34 publications

References 37 publications

Octave-spanning spectral phase control for single-cycle bi-photons

Octave-spanning spectral phase control for single-cycle bi-photons

Alignment-free dispersion measurement with interfering biphotons

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