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8 papers · 2 filters
Coherently manipulating two-qubit quantum information using a pair of simultaneous laser pulses
L. F. Wei, Franco Nori
Several sequential operations are usually needed for implementing controlled quantum gates and generating entanglement between a pair of quantum bits. Based on the conditional quan…
Testing Bell's inequality in constantly coupled Josephson circuits by effective single-qubit operations
L. F. Wei, Yu-xi Liu, Franco Nori
In superconducting circuits with interbit untunable (e.g., capacitive) couplings, ideal local quantum operations cannot be exactly performed on individual Josephson qubits. Here we…
Kraus representation of damped harmonic oscillator and its application
Yu-xi Liu, Sahin Kaya Ozdemir, Adam Miranowicz +1
By definition, the Kraus representation of a harmonic oscillator suffering from the environment effect, modeled as the amplitude damping or the phase damping, is directly given by…
Tomographic measurements on superconducting qubit states
Yu-xi Liu, L. F. Wei, Franco Nori
We propose an approach to reconstruct any superconducting charge qubit state by using quantum state tomography. This procedure requires a series of measurements on a large enough n…
Photon-induced entanglement of distant mesoscopic SQUID rings
A. Vourdas, D. I. Tsomokos, C. C. Chong
An experiment that involves two distant mesoscopic SQUID rings is studied. The superconducting rings are irradiated with correlated photons, which are produced by a single microwav…
Preparation of macroscopic quantum superposition states of a cavity field via coupling to a superconducting charge qubit
Yu-xi Liu, L. F. Wei, Franco Nori
We propose how to generate macroscopic quantum superposition states using a microwave cavity containing a superconducting charge qubit. Based on the measurement of charge states, w…