Atom–light superposition oscillation and Ramsey-like atom–light interferometer

Qiu, Cheng; Chen, Shuying; Chen, L. Q.; Chen, Bing; Guo, Jinxian; Ou, Z. Y.; Zhang, Weiping

doi:10.1364/optica.3.000775

Cited by 26 publications

(23 citation statements)

References 39 publications

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“…To satisfy the criteria κ > 1/2G I ps under a gian G 2 = 10, we need a very large power of phase sensing beam 1.57 × 10 4 W. This is difficult to realize experimentally. In reference [29], we know that the magnitude of AC Stark shift is of the same order for atomic vapor and cold atomic ensemble. And the atomic numbers in interaction region for two atomic systems are both 10 9 − 10 10 [28,29,43].…”

Section: Resultsmentioning

confidence: 99%

“…If we can measure the atomic phase shift, we will be able to measure the photon number of the probe light. The atomic phase can be measured by a new type of interferometers, which were recently demonstrated [27][28][29]. This type of interferometers is an atom-light hybrid interferometer that involves both atoms and light in the interference and is sensitive to the phases of both atoms and light.…”

Section: Atomic Phase Shift By Ac Stark Effectmentioning

confidence: 99%

“…There are two types of atom-light interferometers [28,29,32,33]. The first type is an analog of Mach-Zehnder/Michaelson optical interferometer but with atom-light mixer replacing regular beam splitters for linear superposition of atomic waves and optical waves [27,29]. We call it linear atom-light interferometer, whose laser frequencies are shown in Fig.…”

Section: Qnd Measurement Of Photon Number By Atom-light Interferometersmentioning

confidence: 99%

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Quantum non-demolition measurement of photon number with atom-light interferometers

Chen

et al. 2017

Opt. Express

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When atoms are illuminated by an off-resonant field, the AC Stark effect will lead to phase shifts in atomic states. The phase shifts are proportional to the photon number of the off-resonant illuminating field. By measuring the atomic phase with newly developed atom-light hybrid interferometers, we can achieve quantum non-demolition measurement of the photon number of the optical field. In this paper, we analyze theoretically the performance of this QND measurement scheme by using the QND measurement criteria established by Holland et al [Phys. Rev. A 42, 2995 (1990)]. We find the quality of the QND measurement depends on the phase resolution of the atom-light hybrid interferometers. We apply this QND measurement scheme to a twin-photon state from parametric amplifier to verify the photon correlation in the twin beams. Furthermore, a sequential QND measurement procedure is analyzed for verifying the projection property of quantum measurement and for the quantum information tapping. Finally, we discuss the possibility for single-photon-number-resolving detection via QND measurement.

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Section: Resultsmentioning

confidence: 99%

Section: Atomic Phase Shift By Ac Stark Effectmentioning

confidence: 99%

Section: Qnd Measurement Of Photon Number By Atom-light Interferometersmentioning

confidence: 99%

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Quantum non-demolition measurement of photon number with atom-light interferometers

Chen

et al. 2017

Opt. Express

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“…The atomic-ensemble-based schemes hold an advantage over spontaneous parametric down-conversion processes (SPDC) in nonlinear crystals and optical parametric oscillators [20,65,66], that also rely on engineered PM, as the photons generated in atomic ensembles are inherently narrowband and atom-resonant, making them suitable for quantum metrology [67] and repeater-based communication [2,68,69]. With purely atomic photonpair source, potentially difficult engineering of cavitybased SPDC can be avoided [70,71].…”

Section: Comparison With Spdcmentioning

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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“…While the non-Hermitian interference is of great importance conceptually and fundamentally, realizing a full controllable non-Hermitian BS is still a challenge. It is anticipated that any conversion process between excitations could be treated as a BS [14,15], therefore a hybrid atom-light interface provides an appealing and versatile platform to study the photon-matter interference [16,17]. Driven by an external optical field, magnon in an atomic ensemble, also known as collective atomic spin-wave excitation [18], could be converted to photon.…”

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confidence: 99%

Non-Hermitian Magnon-Photon Interference in an Atomic Ensemble

et al. 2019

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The beam-splitter (BS) is one of the most common and important components in modern optics, and lossless BS which features unitary transformation induces Hermitian evolution of light. However, the practical BS based on the conversion between different degree of freedoms are naturally non-Hermitian, as a result of essentially open quantum dynamics. In this work, we experimentally demonstrate a non-Hermitian BS for the interference between traveling photonic and localized magnonic modes. The non-Hermitian magnon-photon BS is achieved by the coherent and incoherent interaction mediated by the excited levels of atoms, which is reconfigurable by adjusting the detuning of excitation. Unconventional correlated interference pattern is observed at the photon and magnon output ports. Our work is potential for extending to single-quantum level to realize interference between a single photon and magnon, which provides an efficient and simple platform for future tests of non-Hermitian quantum physics.

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Atom–light superposition oscillation and Ramsey-like atom–light interferometer

Cited by 26 publications

References 39 publications

Quantum non-demolition measurement of photon number with atom-light interferometers

Quantum non-demolition measurement of photon number with atom-light interferometers

Superradiant parametric conversion of spin waves

Non-Hermitian Magnon-Photon Interference in an Atomic Ensemble

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