Observation of temporal beating in first- and second-order intensity measurement between independent Raman Stokes fields in atomic vapor

Chen, Liqing; Bian, Cheng-ling; Zhang, Guo-Wan; Ou, Z. Y.; Zhang, Weiping

doi:10.1103/physreva.82.033832

Cited by 13 publications

(16 citation statements)

References 24 publications

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“…In the same year, Ou et al reported a similar beating experiment with blue and green laser light beams [9]. The second-order interference with photons of different spectra was further studied with photons generated by spontaneous parametric down conversion [10][11][12][13][14][15][16], single-photon sources [17], laser and single-photon source [18], chirped laser pulses [19], and spontaneous Raman process [20], etc. These experiments can be categorized into two groups.…”

Section: Introductionmentioning

confidence: 95%

Two-photon interference with non-identical photons

Liu

Zheng

Chen

et al. 2015

Optics Communications

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Keywords:Two-photon interference Second-order temporal beating Interference with photons of different colors a b s t r a c t Two-photon interference with non-identical photons is studied based on the superposition principle in Feynman's path integral theory. The second-order temporal interference pattern is observed by superposing laser and pseudothermal light beams with different spectra. The reason why there is two-photon interference for photons of different spectra is that non-identical photons can be indistinguishable for the detection system when Heisenberg's uncertainty principle is taken into account. These studies are helpful to understand the second-order interference of light in the language of photons.

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Section: Introductionmentioning

confidence: 95%

Two-photon interference with non-identical photons

Liu

Zheng

Chen

et al. 2015

Optics Communications

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“…3. Because of the different AC Stark shifts caused by uneven pumping from W 1 and W 2 fields and from R 1 and R 2 fields, both S W and S R exhibit beat signals [19]. As seen from Fig.…”

Section: Experiments Setup and Resultsmentioning

confidence: 87%

“…Let us demonstrate next with a simple theory how this can be achieved. From [19], we learn that the intensities of the output fields S W , S R after mixing have the form of…”

Section: Theorymentioning

confidence: 99%

“…If we consider the decoherence of atomic spin wave [19], the normalized intensity correlation function is g (2) = g…”

Section: Theorymentioning

confidence: 99%

“…Spontaneous Raman process only involves the injected pump laser and is simpler compared to the stimulated Raman process. But the phases of the Stokes fields generated in spontaneous process are random from one shot to the next [18][19][20], which prevents us from using the traditional first-order interference method to write and retrieve the phase information. Fortunately, in spontaneous Raman scattering, besides the Stokes field, another field known as the atomic spin wave is also generated simultaneously and there exists a phase anti-correlation between the generated Stokes field and the atomic spin wave [20].…”

Section: Introductionmentioning

confidence: 99%

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Extracting the phase information from atomic memory by intensity correlation measurement

et al. 2015

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Abstract:We demonstrate experimentally controlled storage and retrieval of the optical phase information in a higher-order interference scheme based on Raman process in 87 Rb atomic vapor cells. An interference pattern is observed in intensity correlation measurement between the write Stokes field and the delayed read Stokes field as the phase of the Raman write field is scanned. This result implies that the phase information of the Raman write field can be written into the atomic spin wave via Raman process in a high gain regime and subsequently read out via a spin-wave enhanced Raman process, thus achieving optical storage of phase information. This technique should find applications in optical phase image storage, holography and information processing.

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Quantum remote sensing with atom-light entangled interface

Shi

Ming

et al. 2022

Quantum Front

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Quantum remote sensing utilizes quantum entanglement between the probe and the receiver to enhance the capability to sense a remote target. Quantum illumination is considered as a promising protocol to realize such a quantum technology in an environment of high loss and intense noise. However, the protocol requires an additional on-demand quantum memory, the imperfect performance of which diminishes the quantum advantage and limits the enhancement of sensing. In this paper, we propose a new protocol for quantum remote sensing based on quantum illumination with atom-light entangled interface. Compared to conventional light-only quantum illumination, the proposed protocol utilizes Raman coupling to create a long-lived atomic spin wave entangled with a Stokes light. The atomic spin wave, automatically built-in memory via the Raman coupling, acts as a local reference. The entangled Stokes light is used as a probe to irradiate a remote target. Meanwhile, the returned probe light from target is detected through coupling again to the atomic spin wave. A joint measurement on the returned probe light and spin wave is performed to discriminate the target. A 4 dB quantum enhancement over classical illumination is estimated. The atom-light entangled interface naturally integrates the quantum source, quantum memory, and quantum receiver in a single unit which exhibits great potential to develop highly compact and portable devices for quantum-enhanced remote sensing.

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Observation of temporal beating in first- and second-order intensity measurement between independent Raman Stokes fields in atomic vapor

Cited by 13 publications

References 24 publications

Two-photon interference with non-identical photons

Two-photon interference with non-identical photons

Extracting the phase information from atomic memory by intensity correlation measurement

Quantum remote sensing with atom-light entangled interface

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