Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Laser & Optoelectronics Progress

Application of Two-photon Entangled State Prepared by SpontaneousParametric Down-conversion in Quantum Information

Jiang Yun-kun

Published Jan 1, 2002• 0 citations
OpenAlex

Abstract

The development of preparing two-photon entangled state by spontaneous parametric down-conversion, its principle and use in quantum information are described, and the domestic progress in this fieldis introduced.

Related papers

Entangled biphoton source - property and preparation

Yanhua H. Shih

One of the most surprising consequences of quantum mechanics is the entanglement of two or more distance particles. Even though there are still questions regarding the fundamental issues of quantum theory, quantum entanglement has started to play important roles in practical engineering applications such as quantum information processing, quantum metrology, quantum imaging and quantum lithography. Two-photon states have been the most popular entangled states in fundamental and applied research. Using spontaneous parametric down conversion as an example, this review introduces the concept of biphoton wavepacket and emphasizes the very different physics associated with the entangled two-photon system (pure state) and with the `individual' subsystems (statistical mixture). Experimental approaches for Bell state preparation, pumped by continous wave and ultrashort pulse are discussed.

Reports on Progress in Physics•May 13, 2003•252 citations

Quantum Optics and Quantum Information with Twin Photon

P. H. Souto Ribeiro

In the non-linear process called parametric down-conversion, it is possible to perform frequency conversion in the optical domain. For instance, when one laser beam shines a non-linear crystal, some of its photons are converted into two new photons with frequencies that are different from the frequency of the incident laser. This process is also called parametric down-conversion, because it is based in spontaneous emmission. The pair of photons obtained, are produced basically in the same instant of time, then they are called twin photons. Moreover, besides simultaneity, they also share a non-factorable quantum state. This property makes these photons a very special tool, because they are in an entangled state for some degrees of freedom and they can be prepared in an entangled state for other ones. In this talk, I will discuss the motivation of Quantum Computation and Quantum Communication, present the concept of Quantum Entanglement, and discuss the application of photoic entanglement for the understanding of the Foundations of Quantum Mechanics and the research in Quantum Information.

Physicae Proceedings•Mar 29, 2012•0 citations

Sideband entanglement preparation and their applications in quantum information science

Shaoping Shi, Yimiao Wu, Xuan Liu +4 more

In the field of quantum information science, the development of quantum resources for generating copious entangled photons remains a critical challenge. Leveraging the broad spectral characteristics of the parametric down-conversion process, numerous sideband modes distributed symmetrically around the squeezed light in the frequency domain exhibit quantum noise correlations analogous to einstein-podolsky-rosen (EPR) entanglement, which also termed as sideband entanglement. Owing to their distinct advantages in deterministic entanglement distribution, high-capacity entanglement generation, and high-efficiency detection, continuous-variable entangled sideband modes hold significant promise for applications in quantum information science. In this paper, the development of quantum sideband entanglement and experimental progress over the past two decades are reviewed.

Intelligent Opto-Electronics•Jan 1, 2025•0 citations

Characterization of a Quantum Light Source Based on Spontaneous Parametric Down-Conversion

T. J. Huisman, S.R. Huisman, Allard P. Mosk +1 more

We have built a quantum light source capable of producing different types of quantum states. The quantum light source is based on entangled state preparation in the process of spontaneous parametric down-conversion. The single-photon detection rate of eight-hundred thousand per second demonstrates that we have created a bright state-of-the-art quantum light source. As a part of the characterization we measured two-photon quantum interference in a Hong-Ou-Mandel interferometer.

arXiv:1302.2816•Feb 12, 2013•0 citations

Experimental Engineering of Photonic Quantum Entanglement

Stefanie Barz, G. Cronenberg, Philip John Walther

Entangled photons are a crucial resource for linear optical quantum communication and quantum computation. Besides the remarkable progress of photon state engineering using atomic memories (Kimble (2008); Yuan et al. (2008)) the majority of current experiments is based on the production of photon pairs in the process of spontaneous parametric down-conversion (SPDC), where the entangled photon pair is concluded from post-selection of randomly occurring coincidences. Here we present new insights into the heralded generation of photon states (Barz et al. (2010); Wagenknecht et al. (2010)) that are maximally entangled in polarization (Schrodinger (1935)) with linear optics and standard photon detection from SPDC (Kwiat et al. (1995)). We utilize the down-conversion state corresponding to the generation of three pairs of photons, where the coincident detection of four auxiliary photons unambiguously heralds the successful preparation of the entangled state (Śliwa & Banaszek (2003)). This controlled generation of entangled photon states is a significant step towards the applicability of a linear optics quantum network (Nielsen & Chuang (2000)), in particular for entanglement distribution (Bennett et al. (1996)), entanglement swapping (Kaltenbaek et al. (2009); Pan et al. (1998)), quantum teleportation (Bouwmeester et al. (1997)), quantum cryptography (Bennett & Brassard (1984); Ekert (1991); Jennewein et al. (2000)) and scalable approaches towards photonics-based quantum computing schemes (Browne & Rudolph (2004); Gottesman & Chuang (1999); Knill et al. (2001)).

InTech eBooks•Mar 21, 2012•0 citations

Optical technologies for quantum information science

Paul G. Kwiat, Joseph B. Altepeter, Julio T. Barreiro +4 more

A number of optical technologies remain to be developed and optimized for various applications in quantum information processing, especially quantum communication. We will give an overview of our approach to some of these, including periodic heralded single-photon sources based on spontaneous parametric down-conversion, ultrabright sources of tunable entangled photons, near unit efficiency single- and multi-photon detectors based on an atomic vapor interaction, quantum state transducers based on high efficiency frequency up-conversion, and low-loss optical quantum memories.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Feb 3, 2004•4 citations
One of the most surprising consequences of quantum mechanics is the entanglement of two or more distance particles. Even though there are still questions regarding the fundamental issues of quantum theory, quantum entanglement has started to play important roles in practical engineering applications such as quantum information processing, quantum metrology, quantum imaging and quantum lithography. Two-photon states have been the most popular entangled states in fundamental and applied research. Using spontaneous parametric down conversion as an example, this review introduces the concept of biphoton wavepacket and emphasizes the very different physics associated with the entangled two-photon system (pure state) and with the `individual' subsystems (statistical mixture). Experimental approaches for Bell state preparation, pumped by continous wave and ultrashort pulse are discussed.
In the non-linear process called parametric down-conversion, it is possible to perform frequency conversion in the optical domain. For instance, when one laser beam shines a non-linear crystal, some of its photons are converted into two new photons with frequencies that are different from the frequency of the incident laser. This process is also called parametric down-conversion, because it is based in spontaneous emmission. The pair of photons obtained, are produced basically in the same instant of time, then they are called twin photons. Moreover, besides simultaneity, they also share a non-factorable quantum state. This property makes these photons a very special tool, because they are in an entangled state for some degrees of freedom and they can be prepared in an entangled state for other ones. In this talk, I will discuss the motivation of Quantum Computation and Quantum Communication, present the concept of Quantum Entanglement, and discuss the application of photoic entanglement for the understanding of the Foundations of Quantum Mechanics and the research in Quantum Information.
In the field of quantum information science, the development of quantum resources for generating copious entangled photons remains a critical challenge. Leveraging the broad spectral characteristics of the parametric down-conversion process, numerous sideband modes distributed symmetrically around the squeezed light in the frequency domain exhibit quantum noise correlations analogous to einstein-podolsky-rosen (EPR) entanglement, which also termed as sideband entanglement. Owing to their distinct advantages in deterministic entanglement distribution, high-capacity entanglement generation, and high-efficiency detection, continuous-variable entangled sideband modes hold significant promise for applications in quantum information science. In this paper, the development of quantum sideband entanglement and experimental progress over the past two decades are reviewed.
Entangled photons are a crucial resource for linear optical quantum communication and quantum computation. Besides the remarkable progress of photon state engineering using atomic memories (Kimble (2008); Yuan et al. (2008)) the majority of current experiments is based on the production of photon pairs in the process of spontaneous parametric down-conversion (SPDC), where the entangled photon pair is concluded from post-selection of randomly occurring coincidences. Here we present new insights into the heralded generation of photon states (Barz et al. (2010); Wagenknecht et al. (2010)) that are maximally entangled in polarization (Schrodinger (1935)) with linear optics and standard photon detection from SPDC (Kwiat et al. (1995)). We utilize the down-conversion state corresponding to the generation of three pairs of photons, where the coincident detection of four auxiliary photons unambiguously heralds the successful preparation of the entangled state (Śliwa & Banaszek (2003)). This controlled generation of entangled photon states is a significant step towards the applicability of a linear optics quantum network (Nielsen & Chuang (2000)), in particular for entanglement distribution (Bennett et al. (1996)), entanglement swapping (Kaltenbaek et al. (2009); Pan et al. (1998)), quantum teleportation (Bouwmeester et al. (1997)), quantum cryptography (Bennett & Brassard (1984); Ekert (1991); Jennewein et al. (2000)) and scalable approaches towards photonics-based quantum computing schemes (Browne & Rudolph (2004); Gottesman & Chuang (1999); Knill et al. (2001)).
A number of optical technologies remain to be developed and optimized for various applications in quantum information processing, especially quantum communication. We will give an overview of our approach to some of these, including periodic heralded single-photon sources based on spontaneous parametric down-conversion, ultrabright sources of tunable entangled photons, near unit efficiency single- and multi-photon detectors based on an atomic vapor interaction, quantum state transducers based on high efficiency frequency up-conversion, and low-loss optical quantum memories.