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12 papers · 2 filters
Multiqubit tunable phase gate of one qubit simultaneously controlling qubits in a cavity
Chui-Ping Yang, Shi-Biao Zheng, Franco Nori
We propose how to realize a multiqubit tunable phase gate of one qubit simultaneously controlling qubits with four-level quantum systems in a cavity or coupled to a resonator.…
Quantum dynamics of spatial decoherence of two atoms in a ring cavity
Li Zheng, Chui-Ping Yang, Franco Nori
We study the spatial decoherence dynamics for the relative position of two atoms in a singlemode ring cavity. We find that the spatial decoherence of the two atoms depends strongly…
Control-free control: manipulating a quantum system using only a limited set of measurements
S. Ashhab, Franco Nori
We present and discuss different protocols for preparing an arbitrary quantum state of a qubit using only a restricted set of measurements, with no unitary operations at all. We sh…
Quantum spin squeezing
Jian Ma, Xiaoguang Wang, C. P. Sun +1
This paper reviews quantum spin squeezing, which characterizes the sensitivity of a state with respect to an SU(2) rotation, and is significant for both entanglement detection and…
An iterative approach for amplitude amplification with nonorthogonal measurements
H. T. Ng, Franco Nori
Using three coupled harmonic oscillators, we present an amplitude-amplification method for factorization of an integer. We generalize the method in [arXiv:1007.4338] by employing n…
A qubit strongly-coupled to a resonant cavity: asymmetry of the spontaneous emission spectrum beyond the rotating wave approximation
Xiufeng Cao, J. Q. You, Hang Zheng +1
We investigate the spontaneous emission spectrum of a qubit in a lossy resonant cavity. We use neither the rotating-wave approximation nor the Markov approximation. The qubit-cavit…