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21 papers · 2 filters
Formation of helical ion chains
Ramil Nigmatullin, Adolfo del Campo, Gabriele De Chiara +3
We study the nonequilibrium dynamics of the linear to zigzag structural phase transition exhibited by an ion chain confined in a trap with periodic boundary conditions. The transit…
Non-Demolition Dispersive Measurement of a Superconducting Qubit with a Microstrip SQUID Amplifier
G. P. Berman, D. I. Kamenev, D. Kinion +1
We have studied the possibility of a single-shot non-demolition measurement of a superconducting qubit using a microstrip SQUID amplifier (MSA). The Johnson noise generated by all…
The Renormalization Effects in the Microstrip-SQUID Amplifier
G. P. Berman, A. A. Chumak, V. I. Tsifrinovich
The peculiarities of the microstrip-DC SQUID amplifier caused by the resonant structure of the input circuit are analyzed. It is shown that the mutual inductance, that couples the…
Transitional dynamics of a phase qubit-resonator system: requirements for fast readout of a phase qubit
G. P. Berman, A. A. Chumak, V. I. Tsifrinovich
We examine the non-stationary evolution of a coupled qubit-transmission line-resonator system coupled to an external drive and the resonator environment. By solving the equation fo…
The curious nonexistence of Gaussian 2-designs
Robin Blume-Kohout, Peter S. Turner
2-designs -- ensembles of quantum pure states whose 2nd moments equal those of the uniform Haar ensemble -- are optimal solutions for several tasks in quantum information science,…
Non-demolition Adiabatic Measurement of the Phase Qubit State
G. P. Berman, A. A. Chumak, D. I. Kamenev +2
An adiabatic method for a single-shot non-demolition measurement of the phase qubit is suggested. The qubit is inductively coupled to a low-frequency resonator, which in turn is co…