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

International Conference on Quantum Information

On quantum efficiencies of optical states

Dominic William Berry, Alexander I. Lvovsky

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We propose a universal measure of efficiency associated with a quantum-optical state and show that this efficiency cannot be improved by any linear-optical processing combined with destructive conditional measurements.
DOI
10.1364/icqi.2011.qtuh4

Related papers

Preservation of loss in linear-optical processing

Dominic William Berry, Alexander I. Lvovsky

We propose a measure of quantum efficiency of a multimode state of light that quantifies the amount of optical loss this state has experienced, and prove that this efficiency cannot increase in any linear-optical processing with destructive conditional measurements. Any loss that has affected a state can neither be removed nor redistributed so as to further increase the efficiency in higher-efficiency modes at the expense of lower-efficiency modes. This result eliminates the possibility of catalytically improving photon sources.

arXiv:1010.6302•Physical Review A•Oct 4, 2011•7 citations

Maximum efficiency of general two qubit linear-optical state analyzers

Dov Fields, Mark S. Hillery, János A. Bergou +1 more

Bulletin of the American Physical Society•Jun 2, 2021•0 citations

Efficiency limits for linear optical processing of single photons and single-rail qubits

Dominic William Berry, Alexander I. Lvovsky, Barry C. Sanders

We analyze the problem of increasing the efficiency of single-photon sources or single-rail photonic qubits via linear optical processing and destructive conditional measurements. We allow for the use of coherent states and do not limit to photon-counting measurements. We conjecture that, with the limitation that multiphoton components in the output are not permitted, it is not possible to increase the efficiency. We prove this conjecture for several important special cases, and provide extensive numerical results for the general case.

arXiv:quant-ph/0605043•Journal of the Optical Society of America B•Jan 26, 2007•5 citations

On the Quantum-Non-Demolition Measurement of the Energy of Optical Quanta

V. B. Braginsky, S. P. Viatchanin

Springer eBooks•Jan 1, 1983•4 citations

Efficiently preparable states of light enable quantum computing by measurement

Matthias Ohliger

SPIE Newsroom•Jan 1, 2009•1 citation

High-efficiency photonic GHZ measurements with linear optics

Stefan N. van den Hoven, Love A. Pettersson, Anders S. Sørensen +1 more

Probabilistic and destructive Bell-measurements, also known as fusions, constitute a fundamental primitive for photonic quantum technologies. These operations rely only on pairwise photonic interference, whereas the computational power of photonic quantum systems originates from many-body interference. Here, we introduce a family of high-efficiency linear-optical GHZ measurements based on four-mode interferometers and show that incorporating many-body interference into this ubiquitous primitive leads to more efficient entangling operations. For the four-photon case, the success probability is $9/32$, and adaptive variants ensure that unsuccessful events project onto useful stabilizer states. We further show that the approach naturally generalizes to larger GHZ measurements, yielding an exponentially higher success probability than previous linear-optical schemes. Finally, we demonstrate practical advantages for graph-state resource generation, entanglement distribution between remote spin-photon interfaces, and fusion-based quantum computing. Our results establish high-efficiency many-body measurements as a new primitive for scalable photonic quantum information processing.

quant-pharXiv:2610.41524•Nov 2, 2026
We propose a measure of quantum efficiency of a multimode state of light that quantifies the amount of optical loss this state has experienced, and prove that this efficiency cannot increase in any linear-optical processing with destructive conditional measurements. Any loss that has affected a state can neither be removed nor redistributed so as to further increase the efficiency in higher-efficiency modes at the expense of lower-efficiency modes. This result eliminates the possibility of catalytically improving photon sources.
We analyze the problem of increasing the efficiency of single-photon sources or single-rail photonic qubits via linear optical processing and destructive conditional measurements. We allow for the use of coherent states and do not limit to photon-counting measurements. We conjecture that, with the limitation that multiphoton components in the output are not permitted, it is not possible to increase the efficiency. We prove this conjecture for several important special cases, and provide extensive numerical results for the general case.
Probabilistic and destructive Bell-measurements, also known as fusions, constitute a fundamental primitive for photonic quantum technologies. These operations rely only on pairwise photonic interference, whereas the computational power of photonic quantum systems originates from many-body interference. Here, we introduce a family of high-efficiency linear-optical GHZ measurements based on four-mode interferometers and show that incorporating many-body interference into this ubiquitous primitive leads to more efficient entangling operations. For the four-photon case, the success probability is 9/329/329/32, and adaptive variants ensure that unsuccessful events project onto useful stabilizer states. We further show that the approach naturally generalizes to larger GHZ measurements, yielding an exponentially higher success probability than previous linear-optical schemes. Finally, we demonstrate practical advantages for graph-state resource generation, entanglement distribution between remote spin-photon interfaces, and fusion-based quantum computing. Our results establish high-efficiency many-body measurements as a new primitive for scalable photonic quantum information processing.