Estimating the single-photon projection of low-intensity light sources
- URL: http://arxiv.org/abs/2002.05937v2
- Date: Sat, 9 May 2020 09:58:43 GMT
- Title: Estimating the single-photon projection of low-intensity light sources
- Authors: Jorge Rolando Chavez-Mackay, Peter Gr\"unwald, Blas Manuel
Rodr\'iguez-Lara
- Abstract summary: Estimating the quality of a single-photon source is crucial for its use in quantum technologies.
Standard test for semiconductor sources is a value of the second-order correlation function of the emitted field below $1/2$ at zero time-delay.
We derive an effective second-order correlation function, strongly connected to the Mandel-$Q$ parameter.
- Score: 0.34410212782758054
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Estimating the quality of a single-photon source is crucial for its use in
quantum technologies. The standard test for semiconductor sources is a value of
the second-order correlation function of the emitted field below $1/2$ at zero
time-delay. This criterion alone provides no information regarding the
amplitude of the single-photon contribution for general quantum states.
Addressing this question requires the knowledge of additional observables. We
derive an effective second-order correlation function, strongly connected to
the Mandel-$Q$ parameter and given in terms of both the second-order
correlation and the average photon number, that provides a lower bound on the
single-to-multi-photon projection ratio. Using both observables individually
allows for lower and upper bounds for the single-photon projection. Comparing
the tightness of our bounds with those in the literature, we find that relative
bounds may be better described using the average photon number, while absolute
bounds for low excitation states are tighter using the vacuum projection. Our
results show that estimating the quality of a single-photon source based on
additional information is very much dependent on what aspect of the quantum
state of light one is interested in.
Related papers
- Wavevector-resolved polarization entanglement from radiative cascades [27.84599956781646]
We show that there exists an interplay between photon polarization and emission wavevector, strongly affecting quantum correlations when emitters are embedded in micro-cavities.
Our results, backed by theoretical modelling, yield a brand-new understanding of cascaded emission for various quantum emitters.
arXiv Detail & Related papers (2024-09-12T09:32:29Z) - Single-photon sub-Rayleigh precision measurements of a pair of
incoherent sources of unequal intensity [0.0]
We consider single-photon imaging of two point-like emitters of unequal intensity.
We employ multi-plane light conversion technology to experimentally implement Hermite-Gaussian spatial-mode demultiplexing.
arXiv Detail & Related papers (2023-09-05T14:58:34Z) - Eliminating temporal correlation in quantum-dot entangled photon source
by quantum interference [5.617271950792649]
We improve multi-photon entanglement ftextcompwordmark idelity from $(58.7pm 2.2)%$ to $(75.5pm 2.0)%$ by utilizing quantum interferences.
Our work paves the way to realize scalable and high-quality multi-photon states from quantum dots.
arXiv Detail & Related papers (2022-12-26T12:46:04Z) - On-chip quantum information processing with distinguishable photons [55.41644538483948]
Multi-photon interference is at the heart of photonic quantum technologies.
Here, we experimentally demonstrate that detection can be implemented with a temporal resolution sufficient to interfere photons detuned on the scales necessary for cavity-based integrated photon sources.
We show how time-resolved detection of non-ideal photons can be used to improve the fidelity of an entangling operation and to mitigate the reduction of computational complexity in boson sampling experiments.
arXiv Detail & Related papers (2022-10-14T18:16:49Z) - Ultrabright and narrowband intra-fiber biphoton source at ultralow pump
power [51.961447341691]
Nonclassical photon sources of high brightness are key components of quantum communication technologies.
We here demonstrate the generation of narrowband, nonclassical photon pairs by employing spontaneous four-wave mixing in an optically-dense ensemble of cold atoms within a hollow-core fiber.
arXiv Detail & Related papers (2022-08-10T09:04:15Z) - Quantum density matrix theory for a laser without adiabatic elimination
of the population inversion: transition to lasing in the class-B limit [62.997667081978825]
No class-B quantum density-matrix model is available to date, capable of accurately describing coherence and photon correlations within a unified theory.
Here we carry out a density-matrix theoretical approach for generic class-B lasers, and provide closed equations for the photonic and atomic reduced density matrix in the Fock basis of photons.
This model enables the study of few-photon bifurcations and non-classical photon correlations in class-B laser devices, also leveraging quantum descriptions of coherently coupled nanolaser arrays.
arXiv Detail & Related papers (2022-05-26T16:33:51Z) - A multipair-free source of entangled photons in the solid state [0.0]
Multiphoton emission commonly reduces the degree of entanglement of photons generated by non-classical light sources.
Quantum emitters have the potential to overcome this hurdle but, so far, the effect of multiphoton emission on the quality of entanglement has never been addressed in detail.
arXiv Detail & Related papers (2022-03-31T14:50:16Z) - Two-Photon Interference of Single Photons from Dissimilar Sources [0.0]
Entanglement swapping and heralding are at the heart of many protocols for distributed quantum information.
We develop a theoretical description of pulsed two-photon interference of photons from dissimilar sources.
We study their dependence on critical system parameters such as quantum state lifetime and frequency detuning.
arXiv Detail & Related papers (2022-02-10T07:51:27Z) - Quantifying n-photon indistinguishability with a cyclic integrated
interferometer [40.24757332810004]
We report on a universal method to measure the genuine indistinguishability of n-photons.
Our approach relies on a low-depth cyclic multiport interferometer with N = 2n modes.
We experimentally demonstrate this technique for a 8-mode integrated interferometer fabricated using femtosecond laser micromachining.
arXiv Detail & Related papers (2022-01-31T16:30:52Z) - Improved heralded single-photon source with a photon-number-resolving
superconducting nanowire detector [0.0]
We herald a single photon at telecommunication wavelength using a superconducting nanowire detector.
We develop an analytical model using a phase-space formalism that encompasses all multiphoton effects and relevant imperfections.
Our experiment, built using fiber-coupled and off-the-shelf components, delineates a path to engineering ideal sources of single photons.
arXiv Detail & Related papers (2021-12-21T18:48:34Z) - Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
Integrated photonics is a robust platform for quantum information processing.
Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive.
Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
arXiv Detail & Related papers (2020-05-19T16:46:44Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.