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A universal cloner allowing the input to be arbitrary states in symmetric subspace
Heng Fan, Keiji Matsumoto, Xiang-Bin Wang +2
A generalized universal quantum cloning machine is proposed which allows the input to be arbitrary states in symmetric subspace. And it reduces to the universal quantum cloning mac…
NMR C-NOT gate through Aharanov-Anandan's phase shift
Xiang-Bin Wang, Keiji Matsumoto
Recently, it is proposed to do quantum computation through the Berry's phase(adiabatic cyclic geometric phase) shift with NMR (Jones et al, Nature, 403, 869(2000)). This geometric…
Non-adiabatically detecting the geometric phase of the macroscopic quantum state with symmetric SQUID
Wang Xiangbin, Matsumoto Keiji
We give a simple way to detect the geometric phase shift and the conditional geometric phase shift with Josephson junction system. Comparing with the previous work(Falcl G, Fazio R…
Detecting the inseparability and distillability of continuous variable states in Fock space
Wang Xiang-Bin, Matsumoto Keiji, Tomita Akihisa
The partial transposition(PT) operation is an effecient tool in detecting the inseparability of a mixed state. We give an explicit formula for the PT operation for the continuous v…
A quantum-copying machine for equatorial qubits
Heng Fan, Xiang-Bin Wang, Keiji Matsumoto
Bužek and Hillery proposed a universal quantum-copying machine (UQCM) (i.e., transformation) to analyze the possibility of cloning arbitrary states. The UQCM copies quantum-mechani…
Quantum cloning machines for equatorial qubits
Heng Fan, Keiji Matsumoto, Xiang-Bin Wang +1
Quantum cloning machines for equatorial qubits are studied. For the case of 1 to 2 phase-covariant quantum cloning machine, we present the networks consisting of quantum gates to r…
Non-adiabatic conditional geometric phase shift with NMR
Wang Xiang-Bin, Matsumoto Keiji
Conditional geometric phase shift gate, which is fault tolerate to certain errors due to its geometric property, is made by NMR technique recently under adiabatic condition. By the…