Phase memory across two single-photon interferometers including wavelength conversion

Heuer, Axel; Raabe, Sebastian; Menzel, Ralf

doi:10.1103/physreva.90.045803

Cited by 26 publications

(24 citation statements)

References 14 publications

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“…The term a † i1 a i1 accounts for the stimulated generation of the signal fields from the two crystals. If there is no applied idler field incident on BBO1, a † i1 a i1 = 0 and R then gives the interference pattern due to induced coherence [3,5,7]. Equation (7), based on the assumption of coherent applied fields, predicts a fringe visibility of unity, consistent with the nearly perfect visibility observed (Fig.…”

Section: Theorysupporting

confidence: 64%

“…As a consequence of phase memory [7] we obtained very high visibility for both the signal and idler single-photon fields emitted from one of the two crystals, implying low whichpath knowledge. In this stimulated coherence experiment complementarity is realized up to the theoretical limit specified by K 2 + V 2 ≤ 1.…”

Section: Introductionmentioning

confidence: 88%

“…In the setup just discussed biphotons are also generated by spontaneous down-conversion, which also results in single-photon signal interference as a result of induced coherence [7]; this setup does not distinguish between the interference due to spontaneous and stimulated coherence. However, two crystals can also be synchronized in a "parallel" arrangement when only BBO2 and BBO3 are pumped.…”

Section: B Bbo2 and Bbo3 Pumpedmentioning

confidence: 99%

“…Again the fringe visibility is quite high (V = 94%) and the fringe spacing as expected is 355 nm, the pump wavelength. The interference in this case can be interpreted as a phase memory effect [7].…”

Section: Bbo1 and Bbo3 Pumpedmentioning

confidence: 99%

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Complementarity in biphoton generation with stimulated or induced coherence

2015

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Coherence can be induced or stimulated in parametric down-conversion using two or three crystals when, for example, the idler modes of the crystals are aligned. Previous experiments with induced coherence [Phys. Rev. Lett. 114, 053601 (2015)] focused on which-path information and the role of vacuum fields in realizing complementarity via reduced visibility in single-photon interference. Here we describe experiments comparing induced and stimulated coherence. Different single-photon interference experiments were performed by blocking one of the pump beams in a three-crystal setup. Each counted photon is emitted from one of two crystals and which-way information may or not be available, depending on the setup. Distinctly different results are obtained in the induced and stimulated cases, especially when a variable transmission filter is inserted between the crystals. A simplified theoretical model accounts for all the experimental results and is also used to address the question of whether the phases of the signal and idler fields in parametric down-conversion are correlated.

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Section: Theorysupporting

confidence: 64%

Section: Introductionmentioning

confidence: 88%

Section: B Bbo2 and Bbo3 Pumpedmentioning

confidence: 99%

Section: Bbo1 and Bbo3 Pumpedmentioning

confidence: 99%

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Complementarity in biphoton generation with stimulated or induced coherence

2015

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“…where s1, 2 and i1, 2 indicate spatial modes of down-converted photons generated at first (1) and second (2) passes through the crystal with frequencies s w and , i w p j is the phase acquired by the pump [24][25][26]. Here we assume that the frequency mode spacing is small and substitute the summation over frequency modes by the integration [5,10,27].…”

Section: Theorymentioning

confidence: 99%

Measurement of infrared optical constants with visible photons

Paterova

Yang

et al. 2018

New J. Phys.

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We demonstrate a new scheme for infrared spectroscopy with visible light sources and detectors. The technique relies on the nonlinear interference of correlated photons, produced via spontaneous parametric down conversion in a nonlinear crystal. Visible and infrared photons are split into two paths and the infrared photons interact with the sample under study. The photons are reflected back to the crystal, resembling a conventional Michelson interferometer. Interference of the visible photons is observed and it is dependent on the phases of all three interacting photons: pump, visible and infrared. The transmission coefficient and the refractive index of the sample in the infrared range can be inferred from the interference pattern of visible photons. The method does not require the use of potentially expensive and inefficient infrared detectors and sources, it can be applied to a broad variety of samples, and it does not require a priori knowledge of sample properties in the visible range.

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Induced Coherence via Spontaneous Four‐Wave Mixing in Atomic Ensembles

2021

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Induced coherence was first demonstrated three decades ago in a proof‐of‐principle experiment using entangled photons from spontaneous parametric down‐conversion in nonlinear crystals. This phenomenon is considered an interesting instance of complementarity, which lies at the heart of quantum optics. Here, the first demonstration of induced coherence across two coupled interferometers based on spontaneous four‐wave mixing (SFWM) in two independent hot‐atomic‐vapor‐based entangled photon sources is reported. When both the pump and coupling lasers are split and interact with two warm 87Rb atomic ensembles, single‐photon interference is observed between the two idler photons of the narrowband photon pairs, generated via SFWM from the two cascade‐type atomic systems. Furthermore, it is found that the phase memory effect arises from the phase of the bidirectional counter‐propagating pump and coupling lasers, respectively. This work takes an important step toward the transition to the era of quantum optics being driven by atomic ensembles from solid‐state systems.

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Phase memory across two single-photon interferometers including wavelength conversion

Cited by 26 publications

References 14 publications

Complementarity in biphoton generation with stimulated or induced coherence

Complementarity in biphoton generation with stimulated or induced coherence

Measurement of infrared optical constants with visible photons

Induced Coherence via Spontaneous Four‐Wave Mixing in Atomic Ensembles

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