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Quantum electromechanics: Qubits from buckling nanobars
Sergey Savel'ev, Xuedong Hu, Franco Nori
We propose a mechanical qubit based on buckling nanobars--a NEMS so small as to be quantum coherent.To establish buckling nanobars as legitimate candidates for qubits, we calculate…
An efficient single-step scheme for manipulating quantum information of two trapped ions beyond the Lamb-Dicke limit
L. F. Wei, Franco Nori
Based on the exact conditional quantum dynamics for a two-ion system, we propose an efficient {\it single-step} scheme for coherently manipulating quantum information of two trappe…
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…
Brownian motors
P. Hänggi, F. Marchesoni, F. Nori
In systems possessing a spatial or dynamical symmetry breaking thermal Brownian motion combined with unbiased, non-equilibrium noise gives rise to a channelling of chance that can…
Hybridized solid-state qubit in the charge-flux regime
J. Q. You, J. S. Tsai, Franco Nori
Most superconducting qubits operate in a regime dominated by either the electrical charge or the magnetic flux. Here we study an intermediate case: a hybridized charge-flux qubit w…
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…
Quantum computation with Josephson-qubits by using a current-biased information bus
L. F. Wei, Yu-xi Liu, Franco Nori
We propose an effective scheme for manipulating quantum information stored in a superconducting nanocircuit. The Josephson qubits are coupled via their separate interactions with a…
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…
Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes
J. Q. You, Xuedong Hu, Franco Nori
Charge fluctuations from gate bias and background traps severely limit the performance of a charge qubit in a Cooper-pair box (CPB). Here we present an experimentally realizable me…
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.,…
Coupling Josephson qubits via a current-biased information bus
L. F. Wei, Yu-xi Liu, Franco Nori
Josephson qubits without direct interaction can be effectively coupled by sequentially connecting them to an information bus: a current-biased large Josephson junction treated as a…