Certification of high-dimensional entanglement and Einstein-Podolsky-Rosen steering with cold atomic quantum memory

Dąbrowski, Michał; Mazelanik, Mateusz; Parniak, Michał; Leszczyński, Adam; Lipka, Michał; Wasilewski, Wojciech

doi:10.1103/physreva.98.042126

Cited by 29 publications

(26 citation statements)

References 57 publications

(92 reference statements)

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“…Indeed, they allow to achieve increased sensitivity in quantum imaging schemes, they can boost the transport efficiency of biological compounds, they constitute richer resources for quantum simulation, they lead to higher efficiencies in quantum computing and clock synchronization, and they can be beneficial in quantum metrology applications . Moreover, breakthrough experiments studying quantum information memories have been performed by using high‐dimensional states …”

Section: Introductionmentioning

confidence: 99%

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

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In recent years, there has been a rising interest in high‐dimensional quantum states and their impact on quantum communication. Indeed, the availability of an enlarged Hilbert space offers multiple advantages, from larger information capacity and increased noise resilience, to novel fundamental research possibilities in quantum physics. Multiple photonic degrees of freedom have been explored to generate high‐dimensional quantum states, both with bulk optics and integrated photonics. Furthermore, these quantum states have been propagated through various channels, for example, free‐space links, single‐mode, multicore, and multimode fibers, and also aquatic channels, experimentally demonstrating the theoretical advantages over 2D systems. Here, the state‐of‐the‐art on the generation, propagation, and detection of high‐dimensional quantum states is reviewed. Quantum communication with states living in d‐dimensional Hilbert spaces, qudits, yields great benefits. However, qudits generation, transmission, and detection is not a simple task to accomplish. This review presents the state‐of‐the‐art on the generation, propagation, and measurement of high‐dimensional quantum states, highlighting their advantages, issues, and future perspectives.

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Section: Introductionmentioning

confidence: 99%

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

et al. 2019

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“…Principles of operation at the single-photon level and localization of single-photon flashes are detailed in Refs. [16,[69][70][71]. Here, before the camera, write-out and read-out photons are separated into two regions to allow HBT measurement [see Fig.…”

Section: Sii Experimental Setupmentioning

confidence: 99%

Quantum Optics of Spin Waves through ac Stark Modulation

et al. 2019

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We bring the set of linear quantum operations, important for many fundamental studies in photonic systems, to the material domain of collective excitations known as spin waves. Using the ac Stark effect we realize quantum operations on single excitations and demonstrate a spin-wave analogue of Hong-Ou-Mandel effect, realized via a beamsplitter implemented in the spin wave domain. Our scheme equips atomic-ensemble-based quantum repeaters with quantum information processing capability and can be readily brought to other physical systems, such as doped crystals or room-temperature atomic ensembles. arXiv:1804.05854v2 [quant-ph]

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“…We use an elongated (σ x ×σ y ×σ z = 0.3×0.3×2.5 mm 3 ) ensemble of cold (T ≈ 22 µK) rubidium-87 atoms in the magnetooptical trap (MOT), described in details in [4,59]. Before the actual 6WM experiment the atoms are optically pumped to the |g state (5S 1/2 , F = 1, m F = 1 , see Fig.1(a)).…”

Section: Si Experimental Setup Detailsmentioning

confidence: 99%

“…The spatially resolved detection is performed using homebuilt I-sCMOS camera situated in the far field of the ensemble. The far-field imaging setup was designed using ray-tracing software (ZEMAX) to maximize the field of view and resolution in k-space (see [59] for more details). Detailed description of the I-sCMOS camera itself can be found in [43].…”

Section: Si Experimental Setup Detailsmentioning

confidence: 99%

Superradiant parametric conversion of spin waves

et al. 2019

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Atomic-ensemble spin waves carrying single-photon Fock states exhibit nonclassical many-body correlations in-between atoms. The same correlations are inherently associated with single-photon superradiance, forming the basis of a plethora of quantum light-matter interfaces. We devise a scheme allowing the preparation of spatially-structured superradiant states in the atomic two-photon cascade using spin-wave light storage. We thus show that long-lived atomic ground-state spin waves can be converted to photon pairs opening the way towards non-linear optics of spin waves via multi-wave mixing processes.Spatially extended atomic ensembles are a particularly versatile medium allowing generation and control of light with widely varying properties. Fulfilment of the phasematching (PM) condition facilitates efficient generation, storage and retrieval of single photons. Superradiance is inherently linked to the phase-matched emission and, in particular, spin waves (SW) that store information about light in the atomic coherence are superradiant Dicke states N −1/2 j e iKrj |g 1 . . . h j . . . g N [1]. In practice, the Λ scheme of atomic levels, which forms the basis of the Duan-Lukin-Cirac-Zoller quantum entanglement distribution protocol [2], is well-known for its capabilities to generate photon pairs with both non-trivial temporal [3] and spatially-multimode structure [4]. There, light is interfaced with a coherence between two metastable ground-state sublevels.An alternative ladder or diamond schemes allow generation of two-color photon pairs, and attract much attention [5-8] also for single-photon storage [9, 10] and in Rydberg-blockaded media [11,12]. In those cases the associated SWs lie between a ground state and an excited atomic state and are intermediate steps in the generation of a photon pair. More complex manipulations of those SWs, such as temporal [13][14][15][16][17] and spatial [18] mutli-SW beamsplitters demonstrated for ground-state SWs, remain elusive. Such control would allow SW-based enginieering of photon pair emission, possibly also extensible to deterministic quantum nonlinear optics based on Rydberg atoms [19].Here we show that the properties of a phase-matched cascaded atomic decay can be engineered via proper preparation of the atomic SW state. In particular, we treat the SW prepared in the Raman process as one of the fields participating in the parametric conversion, similarly as a pump field in a spontaneous parametric downconversion (SPDC) in nonlinear crystals [20]. Hitherto schemes necessarily required that the atom starts and ends the wave-mixing processes in the same ground state, as dictated by the principles of energy and momentum conservation. This requirement can be leveraged if the ensemble is first prepared in a superposition state, or in other words some coherence is present.We generate a strong atomic coherence (SW) between |g and |h via Raman interaction in the Λ scheme, as depicted in Fig. 1(a). The two pump fields (P1 and P2), as in Fig. 1(b), then transfer the coherence |g h|...

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Certification of high-dimensional entanglement and Einstein-Podolsky-Rosen steering with cold atomic quantum memory

Cited by 29 publications

References 57 publications

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

Quantum Optics of Spin Waves through ac Stark Modulation

Superradiant parametric conversion of spin waves

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