Back to Search
Start Over
Beating the channel capacity limit for superdense coding with entangled ququarts
- Source :
- Science Advances
- Publication Year :
- 2018
-
Abstract
- Quantum superdense coding protocols enhance channel capacity by using shared quantum entanglement between two users. The channel capacity can be as high as 2 when one uses entangled qubits. However, this limit can be surpassed by using high-dimensional entanglement. We report an experiment that exceeds the limit using high-quality entangled ququarts with fidelities up to 0.98, demonstrating a channel capacity of $2.09\pm0.01$. The measured channel capacity is also higher than that obtained when transmitting only one ququart. We use the setup to transmit a five-color image with a fidelity of 0.952. Our experiment shows the great advantage of high-dimensional entanglement and will stimulate research on high-dimensional quantum information processes.<br />Sci. Adv. 4, eaat9304 (2018)
- Subjects :
- media_common.quotation_subject
Fidelity
FOS: Physical sciences
Quantum entanglement
01 natural sciences
010305 fluids & plasmas
Channel capacity
Superdense coding
Physics::Plasma Physics
Quantum mechanics
0103 physical sciences
Limit (mathematics)
Quantum information
010306 general physics
Quantum
Research Articles
media_common
Computer Science::Information Theory
Physics
Quantum Physics
Multidisciplinary
SciAdv r-articles
Qubit
Quantum Physics (quant-ph)
Research Article
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Science Advances
- Accession number :
- edsair.doi.dedup.....ec0e6d027950f2494d96747bf9bd2495