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36 papers · 2 filters
Nuclear Spins in a Nanoscale Device for Quantum Information Processing
S. K. Ozdemir, A. Miranowicz, T. Ota +3
Coherent oscillations between any two levels from four nuclear spin states of I=3/2 have been demonstrated in a nanometre-scale NMR semiconductor device, where nuclear spins are al…
Security of decoy-state quantum key distribution with inexactly controlled source
Xiang-Bin Wang, Cheng-Zhi Peng, Jun Zhang +1
We show the unconditional security of decoy-state method quantum cryptography with whatever intensity error pattern provided that the error is not too large. Our result immediately…
Information-Disturbance Tradeoff in Quantum State Discrimination
Francesco Buscemi, Massimiliano F. Sacchi
When discriminating between two pure quantum states, there exists a quantitative tradeoff between the information retrieved by the measurement and the disturbance caused on the unk…
Error Exponent in Asymmetric Quantum Hypothesis Testing and Its Application to Classical-Quantum Channel coding
Masahito Hayashi
In the simple quantum hypothesis testing problem, upper bound with asymmetric setting is shown by using a quite useful inequality by Audenaert et al, quant-ph/0610027, which was or…
Quantum Thermodynamic Cycles and quantum heat engines
H. T. Quan, Yu-xi Liu, C. P. Sun +1
In order to describe quantum heat engines, here we systematically study isothermal and isochoric processes for quantum thermodynamic cycles. Based on these results the quantum vers…
Channel correction via quantum erasure
Francesco Buscemi
By exploiting a generalization of recent results on environment-assisted channel correction, we show that, whenever a quantum system undergoes a channel realized as an interaction…