Einstein-Podolsky-Rosen Energy-Time Entanglement of Narrow-Band Biphotons

Mei, Yefeng; Zhou, Yunfeng; Zhang, Shanchao; Li, Jianfeng; Liao, Kai-Yu; Yan, Hui; Zhu, Shi-Liang; Du, Shengwang

doi:10.1103/physrevlett.124.010509

Cited by 24 publications

(16 citation statements)

References 36 publications

(47 reference statements)

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“…Energy‐time‐entangled biphoton have been studied. [ 8–12 ] In cold atomic systems, by using photon–atom interfaces that match an atomic transition, entangled photon pairs with narrow bands, long coherence times, and high detection rates can be generated by spontaneous four‐wave mixing (SFWM) processes. [ 13,14 ] Furthermore, by analyzing the linear and nonlinear susceptibilities of SFWM, several attractive properties of entangled photon pairs have been obtained, including Rabi oscillations [ 10 ] and Sommerfeld–Brillouin optical precursors.…”

Section: Introductionmentioning

confidence: 99%

Coherent Control of Multiphoton Using Multidressing Fields

Xiong

et al. 2021

Annalen der Physik

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The competition and coexistence between linear and nonlinear multiphoton optical responses in multidressing fields; these exhibit shaping temporal waveforms is investigated. In the group delay regime, the width of the rectangular profile in double‐dressing fields is reduced compared to that of the single‐dressing field. In the Rabi oscillation regime, the number of periods in double‐dressing fields increases relative to the single‐dressing field, and the tri‐ and quadphotons are observed to feature six and nine coherent channels, respectively. Finally, changing the optical depth and power of the dressing field can alter the optical response. Compared with the single‐dressing field, cascaded and nested double‐dressing fields reduce the linear coherence time and increase the number of periods; this is useful for photon storage and long‐distance communication. Moreover, increasing the number of dressing coherent channels increases the high‐dimensional entangled information capacity, which is more conducive to the realization of quantum communication and quantum networks.

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Section: Introductionmentioning

confidence: 99%

Coherent Control of Multiphoton Using Multidressing Fields

Xiong

et al. 2021

Annalen der Physik

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“…In the past, several studies have used EPR-correlations measurements in the position-momentum variables in order to demonstrate position-momentum entanglement [4][5][6][7][8][9][10][11]. EPRcorrelation measurements have also been used as witnesses of entanglement in many other continuous variables including time-energy [12][13][14], angle-orbital angular momentum (OAM) [15], radial position-radial momentum [16], and quadrature phase-amplitude [17]. More recently, even in entangled systems not consisting of photons, EPR-correlations measurements have become important tools for witnessing continuous-variable entanglement.…”

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confidence: 99%

“…Therefore, it is very important to have a more accurate tech-nique for measuring EPR-correlations. In the past few years, many schemes with increased accuracy have been demonstrated [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, all these methods involve coincidence detection, implemented either by using two scanning single-photon detectors [4], or two scanning slits [5,6], or array of single-photon detectors [7,8], or EM-CCD cameras [9][10][11].…”

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confidence: 99%

“…We have experimentally demonstrated this technique with pure two-photon states produced by type-I SPDC and have obtained the most accurate measurement of position-momentum EPR correlations reported so far. Our scheme can be extended for measuring EPRcorrelations in other continuous variables such as timeenergy [12][13][14] and angle-OAM [15]. It is also applicable to pure two-particle states produced using other processes such as spontaneous four-wave mixing [38].…”

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confidence: 99%

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Measurement of two-photon position-momentum EPR correlations through single-photon intensity measurements

Bhattacharjee,

Meher,

Jha

2021

Preprint

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The measurement of the position-momentum EPR correlations of a two-photon state is important for many quantum information applications ranging from quantum key distribution to coincidence imaging. However, all the existing techniques for measuring the position-momentum EPR correlations involve coincidence detection and thus suffer from issues that result in less accurate measurements. In this letter, we propose and demonstrate an experimental scheme that does not require coincidence detection for measuring the EPR correlations. Our technique works for two-photon states that are pure, irrespective of whether the state is separable or entangled. We theoretically show that if the pure two-photon state satisfies a certain set of conditions then the position-momentum EPR correlations can be obtained by doing the intensity measurements on only one of the photons. We experimentally demonstrate this technique for pure two-photon states produced by type-I spontaneous parametric down-conversion, and to the best of our knowledge, we report the most accurate measurement of position-momentum EPR correlations so far.

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“…Spontaneous parametric down-conversion (SPDC) is one of most widely used methods for generating entangled photons, in which a pump photon at a higher frequency interacts with a nonlinear crystal and produces two separate photons at lower frequencies called the signal and idler photons. The entanglement of down-converted photons has been extensively studied in the discrete finite-dimensional bases such as polarization [9], time-bin [10,11], and orbital angular momentum (OAM) [12,13] as well as in the continuous-variable bases such as position-momentum [14][15][16], angle-OAM [17], radial position-radial momentum [18], time-energy [19][20][21]. Although there are several ways of quantifying two-photon entanglement in two-dimensional bases [22], there is no quantifier for more than two-dimensional bases and continuous-variable bases, in which cases one can talk only in terms of entanglement certifiers [23].…”

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confidence: 99%

Propagation-induced entanglement revival

Bhattacharjee,

Joshi,

Karan

et al. 2021

Preprint

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The practical implementation of free-space quantum information tasks requires entanglement to be sustained over long distances and in the presence of turbulent and noisy environments. The transverse position-momentum entanglement of photon pairs produced by parametric down-conversion has found several uses in quantum information science, however, it is not suitable for applications involving long-distance propagation as the entanglement decays very rapidly when photons propagate away from their source. Entanglement is lost after a few centimetres of propagation, and the effect becomes even more pronounced in turbulent environments. In contrast, in this article, we show that entanglement in the angle-orbital angular momentum (OAM) bases exhibits a remarkably different behaviour. As with the position-momentum case, initially, the angle-OAM entanglement decays with propagation, but as the photons continue to travel further from the source, the photons regain their strongly correlated behaviour, and the entanglement returns. We theoretically and experimentally demonstrate this behaviour and show that entanglement returns even in the presence of strong turbulence. The only effect of turbulence is to increase the propagation distance for revival, but once revived, the two photons remain entangled up to an arbitrary propagation distance. This work highlights the role that OAM-angle entanglement will play in applications where quantum information is shared over long distances.

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Einstein-Podolsky-Rosen Energy-Time Entanglement of Narrow-Band Biphotons

Cited by 24 publications

References 36 publications

Coherent Control of Multiphoton Using Multidressing Fields

Coherent Control of Multiphoton Using Multidressing Fields

Measurement of two-photon position-momentum EPR correlations through single-photon intensity measurements

Propagation-induced entanglement revival

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