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pro vyhledávání: '"Smith Graeme"'
Information theory provides a framework for answering fundamental questions about the optimal performance of many important quantum communication and computational tasks. In many cases, the optimal rates of these tasks can be expressed in terms of re
Externí odkaz:
http://arxiv.org/abs/2412.18586
The quantum data processing inequality asserts that two quantum states become harder to distinguish when a noisy channel is applied. On the other hand, a reverse quantum data processing inequality characterizes whether distinguishability is preserved
Externí odkaz:
http://arxiv.org/abs/2411.19890
Autor:
Smith, Graeme, Wu, Peixue
Quantum channel capacities give the fundamental performance limits for information flow over a communication channel. However, the prevalence of superadditivity is a major obstacle to understanding capacities, both quantitatively and conceptually. Ex
Externí odkaz:
http://arxiv.org/abs/2409.03927
Quantum key distribution (QKD) seeks to provide a method of generating cryptographically-secure keys between remote parties while guaranteeing unconditional security. Implementations of high-dimensional QKD using dispersive-optics (DO-QKD) have been
Externí odkaz:
http://arxiv.org/abs/2403.08992
Despite multipartite entanglement being a global property of a quantum state, a number of recent works have made it clear that it can be quantified using only local measurements. This is appealing because local measurements are the easiest to impleme
Externí odkaz:
http://arxiv.org/abs/2401.08065
Autor:
Laracuente, Nicholas, Smith, Graeme
Quantum states naturally decay under noise. Many earlier works have quantified and demonstrated lower bounds on the decay rate, showing exponential decay in a wide variety of contexts. Here we study the converse question: are there uniform upper boun
Externí odkaz:
http://arxiv.org/abs/2312.17450
Autor:
Zhang, Ting, Smith, Graeme, Smolin, John A., Liu, Lu, Peng, Xu-Jie, Zhao, Qi, Girolami, Davide, Ma, Xiongfeng, Yuan, Xiao, Lu, He
Publikováno v:
npj Quantum Inf 10, 60 (2024)
Entanglement and coherence are fundamental properties of quantum systems, promising to power near future quantum technologies, such as quantum computation, quantum communication and quantum metrology. Yet, their quantification, rather than mere detec
Externí odkaz:
http://arxiv.org/abs/2308.07068