Results 1 to 10 of about 12,091 (250)
Information transmission with continuous variable quantum erasure channels [PDF]
Quantum, 2023 Quantum capacity, as the key figure of merit for a given quantum channel, upper bounds the channel's ability in transmitting quantum information. Identifying different types of channels, evaluating the corresponding quantum capacity, and finding the ...
Changchun Zhong +2 more
doaj +1 more source
Topological Defects in General Quantum LDPC Codes [PDF]
, 2021 We consider the structure of defects carrying quantum information in general quantum low-density parity-check (LDPC) codes. These generalize the corresponding constructions for topological quantum codes, without the need for locality. Relation of such defects to (generalized) topological entanglement entropy is also discussed.
Lim, Pak Kau +2 more
openaire +2 more sources
Generalized concatenation for quantum codes [PDF]
2009 IEEE International Symposium on Information Theory, 2009 We show how good quantum error-correcting codes can be constructed using generalized concatenation. The inner codes are quantum codes, the outer codes can be linear or nonlinear classical codes. Many new good codes are found, including both stabilizer codes as well as so-called nonadditive codes.
Markus Grassl, Peter W. Shor, Bei Zeng
openaire +4 more sources
Generalized concatenated quantum codes [PDF]
Physical Review A, 2009 We introduce the concept of generalized concatenated quantum codes. This generalized concatenation method provides a systematical way for constructing good quantum codes, both stabilizer codes and nonadditive codes. Using this method, we construct families of new single-error-correcting nonadditive quantum codes, in both binary and nonbinary cases ...
Grassl, Markus +4 more
openaire +4 more sources
Quantum-Classical Hybrid Systems and their Quasifree Transformations [PDF]
Quantum, 2023 We study continuous variable systems, in which quantum and classical degrees of freedom are combined and treated on the same footing. Thus all systems, including the inputs or outputs to a channel, may be quantum-classical hybrids.
Lars Dammeier, Reinhard F. Werner
doaj +1 more source
CODES FOR KEY GENERATION IN QUANTUM CRYPTOGRAPHY [PDF]
International Journal of Quantum Information, 2005 As an alternative to the usual key generation by two-way communication in schemes for quantum cryptography, we consider codes for key generation by one-way communication. We study codes that could be applied to the raw key sequences that are ideally obtained in recently proposed scenarios for quantum key distribution, which can be regarded as ...
Englert, B.-G. +3 more
openaire +3 more sources
Dense Coding with Locality Restriction on Decoders: Quantum Encoders versus Superquantum Encoders
PRX Quantum, 2022 We investigate practical dense coding by imposing locality restrictions on decoders and symmetry restrictions on encoders within the resource theory of asymmetry framework.
Masahito Hayashi, Kun Wang
doaj +1 more source
Quantum Obfuscation of Generalized Quantum Power Functions with Coefficient
Entropy, 2023 Quantum obfuscation is one of the important primitives in quantum cryptography that can be used to enhance the security of various quantum cryptographic schemes.
Yazhuo Jiang +3 more
doaj +1 more source
Generalized noiseless quantum codes utilizing quantum enveloping algebras [PDF]
Journal of Physics A: Mathematical and General, 2001 A generalization of the results of Rasetti and Zanardi concerning avoiding errors in quantum computers by using states preserved by evolution is presented. The concept of dynamical symmetry is generalized from the level of classical Lie algebras and groups to the level of dynamical symmetry based on quantum Lie algebras and quantum groups (in the sense
Đurđevich, Micho +2 more
openaire +3 more sources
Quantum Teleportation and Entanglement of the 5-Qubit State Over a GHZ-Like Channel
Tikrit Journal of Pure Science, 2023 Quantum information processing has a wide range of uses, including the solution of complex algorithms, cryptography, dense coding, quantum computation, and quantum teleportation.
Aseel Hamad +2 more
doaj +1 more source