1.8k citations · 10k across the 145 of their papers we have counts for
7 papers · 2 filters
Optimal Quantum State Estimation with Use of the No-Signaling Principle
Yeong-Deok Han, Joonwoo Bae, Xiang-Bin Wang +1
A simple derivation of the optimal state estimation of a quantum bit was obtained by using the no-signaling principle. In particular, the no-signaling principle determines a unique…
Protecting Two-Qubit Quantum States by -Phase Pulses
Jia-Zhong Hu, Xiang-Bin Wang, LC Kwek
We study the state decay of two qubits interacted with a common harmonic oscillator reservoir. There are both decoherence error and the error caused by the amplitude change of the…
Efficient tomography of quantum processes
Xiang-Bin Wang, J. -Z. Hu, Z. -W. Yu +1
We show with explicit formulas that one can completely identify an unknown quantum process with only one weakly entangled state; and identify a quantum optical Gaussian process wit…
Improving quantum entanglement through single-qubit operations
X. -B. Wang, Z. -W. Yu, J. -Z. Hu +1
We show that the entanglement of a bipartite state can be improved and maximized probabilistically through single-qubit operations only. An experiment is proposed and i…
Secure quantum key distribution in an easy way
Jia-Zhong Hu, Xiang-Bin Wang
Secure quantum key distribution can be achieved with an imperfect single-photon source through implementing the decoy-state method. However, security of all those theoretical resul…
Coexistence of multi-photon processes and longitudinal couplings in superconducting flux qubits
Yu-xi Liu, Cheng-Xi Yang, Hui-Chen Sun +1
In contrast to natural atoms, the potential energies for superconducting flux qubit (SFQ) circuits can be artificially controlled. When the inversion symmetry of the potential ener…