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

arXiv:0811.2953 · Physical Review A

Purification of single-photon entanglement with linear optics

Nicolas Sangouard, Christoph Simon, T. Coudreau, Nicolas Gisin

Published Nov 13, 2008• 38 citations
arXivHTMLPDF

Abstract

We show that single-photon entangled states of the form $\ensuremath{\mid}0⟩\ensuremath{\mid}1⟩+\ensuremath{\mid}1⟩\ensuremath{\mid}0⟩$ can be purified with a simple linear-optics-based protocol, which is eminently feasible with current technology. Besides its conceptual interest, this result is relevant for attractive quantum repeater protocols.

DOI
10.1103/physreva.78.050301

Related papers

Purification of Single-Photon Entanglement

D. Salart, Olivier Landry, Nicolas Sangouard +8 more

Single-photon entanglement is a simple form of entanglement that exists between two spatial modes sharing a single photon. Despite its elementary form, it provides a resource as useful as polarization-entangled photons and it can be used for quantum teleportation and entanglement swapping operations. Here, we report the first experiment where single-photon entanglement is purified with a simple linear-optics based protocol. In addition to its conceptual interest, this result might find applications in long distance quantum communication based on quantum repeaters.

arXiv:1001.4449•Physical Review Letters•May 6, 2010•53 citations

Protecting single-photon entanglement with both linear amplification and concentration

Yu‐Bo Sheng, Lan Zhou

Single-photon entanglement may be the simplest type of entanglement but it is of vice importance in quantum communication. Here we present a practical protocol for distilling the single-photon entanglement from both photon loss and decoherence. With the help of some local single photons, the probability of single photon loss can be decreased and the less-entangled state can also be recovered to maximally entangled state simultaneously. It only requires some linear optical elements which makes it feasible in current experiment condition. This protocol might find applications in current quantum communications based on the quantum repeaters.

arXiv:1306.1601•Jun 7, 2013•0 citations

Efficient entanglement purification in quantum repeaters

Yu‐Bo Sheng, Lan Zhou, W. W. Cheng +3 more

We present an efficient entanglement purification protocol (EPP) with controlled-not (CNOT) gates and linear optics. With the CNOT gates, our EPP can reach a higher fidelity than the conventional one. Moreover, it does not require the fidelity of the initial mixed state to satisfy F > 1/2. If the initial state is not entangled, it still can be purified. With the linear optics, this protocol can get pure maximally entangled pairs with some probabilities. Meanwhile, it can be used to purify the entanglement between the atomic ensembles in distant locations. This protocol may be useful in long-distance quantum communication.

Chinese Physics B•Mar 1, 2012•11 citations

Entanglement Purification Through Cavity Input-Output Process

Xiaolong Zhang, Feng Mang, Gao Ke-Lin

We propose a scheme to purify entanglement of two atoms from not-too-impure entangled states by checking the parity of the two atoms through the cavity input-output process. As the parity check is made by measurement on single-photon polarization, which would not affect the entanglement of the two atoms, our scheme has the successful probability double of that in a previous well-known scheme with linear optical elements [Nature (London) 410 (2001) 1067], and is insensitive to the photon loss and the detection inefficiency. Experimental feasibility of our scheme with current technology is discussed.

Communications in Theoretical Physics•Aug 1, 2008•2 citations

Hyperdistillation and hyperentanglement purification with linear optics

Leilei Liu, Ru Zhang

Recent years, researchers pay much more attention to hyperentanglement. Protocols to concentrating and purifying hyperentangled photons have been widely discussed using nonliear optics in the past ten years. While, we propose a linear optics scheme supported by a entangled state as a local resource, to implement the hyperentanglement distillation and hyperentanglement purificaiton in one step. In our scheme, the quantum nondemolition (QND) parity-checking measurement in the spatial-mode and polarization DOFs and the qubit amplification could be the key steps. We discuss the decoherence in noisy channel and photon losses simutaneously, which could be feasible with current technologies.

Asia Communications and Photonics Conference•Jan 1, 2015•0 citations

Distilling single-photon entanglement from photon loss and decoherence

Lan Zhou, Yu‐Bo Sheng

Single-photon entanglement (SPE) may be the simplest type of entanglement, but it is of major importance in quantum communication. Here we present a practical protocol for distilling the SPE from both photon loss and decoherence. With the help of some local single photons, the probability of single-photon loss can be decreased and the less-entangled state can also be recovered to the maximally entangled state simultaneously. It only requires some linear optical elements, which makes it feasible in current experiment conditions. This protocol might find applications in current quantum communications based on quantum repeaters.

Journal of the Optical Society of America B•Sep 24, 2013•17 citations
We show that single-photon entangled states of the form \ensuremath∣0⟩\ensuremath∣1⟩+\ensuremath∣1⟩\ensuremath∣0⟩\ensuremath{\mid}0⟩\ensuremath{\mid}1⟩+\ensuremath{\mid}1⟩\ensuremath{\mid}0⟩\ensuremath∣0⟩\ensuremath∣1⟩+\ensuremath∣1⟩\ensuremath∣0⟩ can be purified with a simple linear-optics-based protocol, which is eminently feasible with current technology. Besides its conceptual interest, this result is relevant for attractive quantum repeater protocols.
Single-photon entanglement is a simple form of entanglement that exists between two spatial modes sharing a single photon. Despite its elementary form, it provides a resource as useful as polarization-entangled photons and it can be used for quantum teleportation and entanglement swapping operations. Here, we report the first experiment where single-photon entanglement is purified with a simple linear-optics based protocol. In addition to its conceptual interest, this result might find applications in long distance quantum communication based on quantum repeaters.
Single-photon entanglement may be the simplest type of entanglement but it is of vice importance in quantum communication. Here we present a practical protocol for distilling the single-photon entanglement from both photon loss and decoherence. With the help of some local single photons, the probability of single photon loss can be decreased and the less-entangled state can also be recovered to maximally entangled state simultaneously. It only requires some linear optical elements which makes it feasible in current experiment condition. This protocol might find applications in current quantum communications based on the quantum repeaters.
We present an efficient entanglement purification protocol (EPP) with controlled-not (CNOT) gates and linear optics. With the CNOT gates, our EPP can reach a higher fidelity than the conventional one. Moreover, it does not require the fidelity of the initial mixed state to satisfy F > 1/2. If the initial state is not entangled, it still can be purified. With the linear optics, this protocol can get pure maximally entangled pairs with some probabilities. Meanwhile, it can be used to purify the entanglement between the atomic ensembles in distant locations. This protocol may be useful in long-distance quantum communication.
We propose a scheme to purify entanglement of two atoms from not-too-impure entangled states by checking the parity of the two atoms through the cavity input-output process. As the parity check is made by measurement on single-photon polarization, which would not affect the entanglement of the two atoms, our scheme has the successful probability double of that in a previous well-known scheme with linear optical elements [Nature (London) 410 (2001) 1067], and is insensitive to the photon loss and the detection inefficiency. Experimental feasibility of our scheme with current technology is discussed.
Recent years, researchers pay much more attention to hyperentanglement. Protocols to concentrating and purifying hyperentangled photons have been widely discussed using nonliear optics in the past ten years. While, we propose a linear optics scheme supported by a entangled state as a local resource, to implement the hyperentanglement distillation and hyperentanglement purificaiton in one step. In our scheme, the quantum nondemolition (QND) parity-checking measurement in the spatial-mode and polarization DOFs and the qubit amplification could be the key steps. We discuss the decoherence in noisy channel and photon losses simutaneously, which could be feasible with current technologies.
Single-photon entanglement (SPE) may be the simplest type of entanglement, but it is of major importance in quantum communication. Here we present a practical protocol for distilling the SPE from both photon loss and decoherence. With the help of some local single photons, the probability of single-photon loss can be decreased and the less-entangled state can also be recovered to the maximally entangled state simultaneously. It only requires some linear optical elements, which makes it feasible in current experiment conditions. This protocol might find applications in current quantum communications based on quantum repeaters.