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Qubit-oscillator systems in the ultrastrong-coupling regime and their potential for preparing nonclassical states
S. Ashhab, Franco Nori
We consider a system composed of a two-level system (i.e. a qubit) and a harmonic oscillator in the ultrastrong-coupling regime, where the coupling strength is comparable to the qu…
How the result of a measurement of a component of the spin of a spin-1/2 particle can turn out to be 100 without using weak measurements
S. Ashhab, Franco Nori
We discuss two questions related to the concept of weak values as seen from the standard quantum-mechanics point of view. In the first part of the paper, we describe a scenario whe…
The information about the state of a qubit gained by a weakly coupled detector
S. Ashhab, J. Q. You, Franco Nori
We analyze the information that one can learn about the state of a quantum two-level system, i.e. a qubit, when probed weakly by a nearby detector. In particular, we focus on the c…
Efficient quantum algorithm for preparing molecular-system-like states on a quantum computer
Hefeng Wang, S. Ashhab, Franco Nori
We present an efficient quantum algorithm for preparing a pure state on a quantum computer, where the quantum state corresponds to that of a molecular system with a given number $m…