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

Extracting an entanglement signature from only classical mutual information

David J. Starling, John C. Howell

Published Jan 1, 2011• 1 citation
Publisher

Abstract

We use classical mutual information to characterize two photons measured in three mutually unbiased bases. We theoretically and experimentally compare entangled and separable states and find a bound on the information capacity of the pair.
DOI
10.1364/qels.2011.qtho6

Related papers

Encoding mutually unbiased bases in orbital angular momentum for quantum key distribution

Angela L. Dudley, Mhlambululi Mafu, Sandeep K. Goyal +7 more

We encode mutually unbiased bases (MUBs) using the higher-dimensional orbital angular momentum (OAM) degree of freedom and illustrate how these states are encoded on a phase-only spatial light modulator (SLM). We perform ( d - 1)- mutual unbiased measurements in both a classical prepare and measure scheme and on entangled photon pairs for dimensions ranging from d = 2 to 5. The calculated average error rate, mutual information and secret key rate show an increase in information capacity as well as higher generation rates as the dimension increases.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Feb 25, 2014•1 citation

Extracting an entanglement signature from only classical mutual information

Howell

Conference on Lasers and Electro-Optics•Jan 1, 2011•0 citations

Experimental extraction of an entangled photon pair from two identically decohered pairs

Takashi Yamamoto, Masato Koashi, Şahin Kaya Özdemir +1 more

Nature•Jan 1, 2003•215 citations

Higher-dimensional orbital-angular-momentum-based quantum key distribution with mutually unbiased bases

Mhlambululi Mafu, Angela L. Dudley, Sandeep K. Goyal +7 more

We present an experimental study of higher-dimensional quantum key distribution protocols based on mutually unbiased bases, implemented by means of photons carrying orbital angular momentum. We perform ($d+1$) mutually unbiased measurements in a classically simulated prepare-and-measure scheme and on a pair of entangled photons for dimensions ranging from $d=2$ to 5. In our analysis, we pay attention to the detection efficiency and photon pair creation probability. As security measures, we determine from experimental data the average error rate, the mutual information shared between the sender and receiver, and the secret key generation rate per photon. We demonstrate that increasing the dimension leads to an increased information capacity as well as higher key generation rates per photon. However, we find that the benefit of increasing the dimension is limited by practical implementation considerations, which in our case results in deleterious effects observed beyond a dimension of $d=4$.

arXiv:1402.5810•Physical Review A•Sep 5, 2013•349 citations

Measuring high-dimensional orbital angular momentum quantum states in mutually unbiased bases

Daniel Giovannini, Jacquiline Romero, Jonathan Leach +3 more

Measurements in mutually unbiased bases (MUBs) are integral to quantum science. An underlying principle of a set of MUBs is that a measurement in one such basis provides no information about a measurement in one of the others. This feature is especially relevant for quantum key distribution. We perform a complete set of mutually unbiased measurements for high-dimensional orbital angular momentum (OAM) states of light. For a two-photon entangled state we show that specific joint measurements provide the minimum number of experimental settings required to characterize the quantum state. From these measurements we reconstruct the density matrix describing the high-dimensional two-photon entangled state. The experimental procedure that we outline can be applied to many different multipartite and high-dimensional systems.

•Dec 23, 2012•1 citation

Experimental 11-dimensional two-photon entanglement

Adetunmise C. Dada, Jonathan Leach, Gerald S. Buller +2 more

We have measured previously untested correlations between two entangled photons and obtain violations of generalized Bell-type inequalities [1] strong enough to indicate genuine 11-dimensional entanglement.

Frontiers in Optics•Jan 1, 2011•0 citations
We encode mutually unbiased bases (MUBs) using the higher-dimensional orbital angular momentum (OAM) degree of freedom and illustrate how these states are encoded on a phase-only spatial light modulator (SLM). We perform ( d - 1)- mutual unbiased measurements in both a classical prepare and measure scheme and on entangled photon pairs for dimensions ranging from d = 2 to 5. The calculated average error rate, mutual information and secret key rate show an increase in information capacity as well as higher generation rates as the dimension increases.
We present an experimental study of higher-dimensional quantum key distribution protocols based on mutually unbiased bases, implemented by means of photons carrying orbital angular momentum. We perform (d+1d+1d+1) mutually unbiased measurements in a classically simulated prepare-and-measure scheme and on a pair of entangled photons for dimensions ranging from d=2d=2d=2 to 5. In our analysis, we pay attention to the detection efficiency and photon pair creation probability. As security measures, we determine from experimental data the average error rate, the mutual information shared between the sender and receiver, and the secret key generation rate per photon. We demonstrate that increasing the dimension leads to an increased information capacity as well as higher key generation rates per photon. However, we find that the benefit of increasing the dimension is limited by practical implementation considerations, which in our case results in deleterious effects observed beyond a dimension of d=4d=4d=4.
Measurements in mutually unbiased bases (MUBs) are integral to quantum science. An underlying principle of a set of MUBs is that a measurement in one such basis provides no information about a measurement in one of the others. This feature is especially relevant for quantum key distribution. We perform a complete set of mutually unbiased measurements for high-dimensional orbital angular momentum (OAM) states of light. For a two-photon entangled state we show that specific joint measurements provide the minimum number of experimental settings required to characterize the quantum state. From these measurements we reconstruct the density matrix describing the high-dimensional two-photon entangled state. The experimental procedure that we outline can be applied to many different multipartite and high-dimensional systems.