Phase sensitivity of spatially broadband high-gain 
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 interferometers

Scharwald, D.; Meier, T.; Sharapova, P. R.

doi:10.1103/physrevresearch.5.043158

Cited by 3 publications

(1 citation statement)

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“…Of course, the multimode nature of the generated light can have a deleterious effect on the phase sensitivity, [152] so that it is important in high gain to perfectly match the modes between both crystals. [153] This can be implemented by imaging the output of the first crystal into a second one, giving rise to the experimental demonstration of wide-field SU(1,1) interferometry. [136] The technique of optical coherence tomography (OCT), already introduced in Section 7.2, has also been extended to the high-gain regime.…”

Section: High Gain Regime-induced Emissionmentioning

confidence: 99%

Nonlinear Interferometry: A New Approach for Imaging and Sensing

Fuenzalida,

Giese,

Gräfe

2024

Adv Quantum Tech

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Nonlinear interferometers are a ubiquitous tool in quantum photonics. As such, they allow spooky‐like imaging with undetected light. On the one side their working principle is based on the principle of induced coherence, which is deeply rooted in the heart of quantum mechanics. On the other side, they bear the strong potential to serve as new tool for biomedical imaging. In this review, an extensive overview about nonlinear interferometers and their working principle is given. A particular focus is set on their exploitation for quantum imaging and sensing. In addition, related side topics and further application fields as well as perspectives are provided.

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Section: High Gain Regime-induced Emissionmentioning

confidence: 99%

Nonlinear Interferometry: A New Approach for Imaging and Sensing

Fuenzalida,

Giese,

Gräfe

2024

Adv Quantum Tech

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Quantum imaging beyond the standard-quantum limit and phase distillation

Schaffrath,

Derr,

Gräfe

et al. 2024

New J. Phys.

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Quantum sensing using non-linear interferometers offers the possibility of bicolour imaging, using light that never interacted with the object of interest, and provides a way to achieve phase supersensitivity, i.e. a Heisenberg-type scaling of the phase uncertainty. Such a scaling behaviour is extremely susceptible to noise and only arises at specific phases that define the optimal working point of the device. While phase-shifting algorithms are to some degree robust against the deleterious effects induced by noise they extract an image by tuning the interferometer phase over a broad range, implying an operation beyond the working point. In our theoretical study, we investigate both the spontaneous and the high-gain regime of operation of a non-linear interferometer. In fact, in the spontaneous regime using a distillation technique and operating at the working point leads to a qualitatively similar behaviour. In the high-gain regime, however, typical distillation techniques inherently forbid a scaling better than the standard-quantum limit, as a consequence of the photon statistics of squeezed vacuum. In contrast, an operation at the working point still may lead to a sensitivity below shot noise, even in the presence of noise. Therefore, this procedure opens the perspective of bicolour imaging with a better than shot-noise phase uncertainty by working in the vicinity of the working point. Our results transfer quantum imaging distillation in a noisy environment to the high-gain regime with the ultimate goal of harnessing its full potential by combining bicolour imaging and phase supersensitivity.

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