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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…
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…
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…
Generation of nonclassical photon states using a superconducting qubit in a microcavity
Yu-xi Liu, L. F. Wei, Franco Nori
Based on the interaction between the radiation field and a superconductor, we propose a way to engineer quantum states using a SQUID charge qubit inside a microcavity. This device…
Quantum tomography for solid state qubits
Yu-xi Liu, L. F. Wei, Franco Nori
We propose a method for the tomographic reconstruction of qubit states for a general class of solid state systems in which the Hamiltonians are represented by spin operators, e.g.,…