Quantum Non-Demolition Measurement of Photons

Xia, Keyu

doi:10.5772/intechopen.72871

Cited by 2 publications

(3 citation statements)

References 34 publications

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“…Our error correction protocol requires quantumnondemolition detectors (QND), which are experimentally very challenging. There are in principle many different ways to implement QND, e.g., using physical processes, i.e., cross-Kerr nonlinearities [29,40], photoncavity interactions [28,34], and detecting photons interferometrically using linear optics [32]. Single photon resolution is still challenging using cross-Kerr nonlinearities [29,33].…”

Section: Discussionmentioning

confidence: 99%

“…There are in principle many different ways to implement QND, e.g., using physical processes, i.e., cross-Kerr nonlinearities [29,40], photoncavity interactions [28,34], and detecting photons interferometrically using linear optics [32]. Single photon resolution is still challenging using cross-Kerr nonlinearities [29,33]. However, with cavity quantum electrodynamics and interferometry in linear optics, they have successfully realised the single photon resolution on QND [30][31][32].…”

Section: Discussionmentioning

confidence: 99%

“…6, with a scenario with photon loss (left) and a scenario with no photon loss (right). The facility for each mode consists of a quantum-nondemolition detector (QND) [28][29][30][31][32][33][34], a π/4 polarisation rotation and a polarisation photon detector. A QND detector can measure the number of photons in a mode without destroying the photon.…”

Section: B Error Correctionmentioning

confidence: 99%

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Quantum Conference Key Agreement with Photon Loss

Singkanipa¹,

Kok²

2021

Preprint

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Conference key agreement (CKA) is an information processing task where more than two parties want to share a common secret key. Here, we present a loss-resilient protocol for CKA, based on redundant encoding and error correction. Our protocol provides a speed-up in transmission rate over the existing lossy CKA protocol. However, encoding and error correction come with extra cost. We show that, using photon sources with creation probability p 0.3, our protocol's secret key rate can overcome the existing protocol's. Hence, high probability entangled photon sources are required for realistic implementation of our loss-resilient protocol.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: B Error Correctionmentioning

confidence: 99%

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Quantum Conference Key Agreement with Photon Loss

Singkanipa¹,

Kok²

2021

Preprint

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Experimental study of quantum uncertainty from lack of information

et al. 2022

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Quantum uncertainty is a well-known property of quantum mechanics that states the impossibility of predicting measurement outcomes of multiple incompatible observables simultaneously. In contrast, the uncertainty in the classical domain comes from the lack of information about the exact state of the system. One may naturally ask, whether the quantum uncertainty is indeed a fully intrinsic property of the quantum theory, or whether similar to the classical domain lack of knowledge about specific parts of the physical system might be the source of this uncertainty. This question has been addressed in the previous literature where the authors argue that in the entropic formulation of the uncertainty principle that can be illustrated using the so-called, guessing games, indeed such lack of information has a significant contribution to the arising quantum uncertainty. Here we investigate this issue experimentally by implementing the corresponding two-dimensional and three-dimensional guessing games. Our results confirm that within the guessing-game framework, the quantum uncertainty to a large extent relies on the fact that quantum information determining the key properties of the game is stored in the degrees of freedom that remain inaccessible to the guessing party. Moreover, we offer an experimentally compact method to construct the high-dimensional Fourier gate which is a major building block for various tasks in quantum computation, quantum communication, and quantum metrology.

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Quantum Non-Demolition Measurement of Photons

Cited by 2 publications

References 34 publications

Quantum Conference Key Agreement with Photon Loss

Quantum Conference Key Agreement with Photon Loss

Experimental study of quantum uncertainty from lack of information

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