Publications (16)
Semiconducting double-dot exchange-only qubit dynamics in presence of magnetic and charge noises
E. Ferraro, M. Fanciulli, M. De Michielis
The effects of magnetic and charge noises on the dynamical evolution of the double-dot exchange-only qubit (DEOQ) is theoretically investigated. The DEOQ consisting of three electr…
Coherence time analysis in semiconducting hybrid qubit under realistic experimental conditions
E. Ferraro, M. Fanciulli, M. De Michielis
The unavoidable effect of the environmental noise due to nuclear spins and charge traps is included in the study of the hybrid qubit dynamics. Hybrid qubit dues its name to the adv…
Non-Markovian dynamics of a single electron spin coupled to a nuclear spin bath
E. Ferraro, H. -P. Breuer, A. Napoli +2
We apply the time-convolutionless (TCL) projection operator technique to the model of a central spin which is coupled to a spin bath via nonuniform Heisenberg interaction. The seco…
Non-Markovian dynamics of interacting qubit pair coupled to two independent bosonic baths
I. Sinayskiy, E. Ferraro, A. Napoli +2
The dynamics of two interacting spins coupled to separate bosonic baths is studied. An analytical solution in Born approximation for arbitrary spectral density functions of the bos…
Gate fidelity comparison in semiconducting spin qubit implementations affected by control noises
E. Ferraro, M. Fanciulli, M. De Michielis
A comparison of gate fidelities between different spin qubit types defined in quantum dots and a donor under different control errors is reported. We studied five qubit types, name…
Effective Hamiltonian for the hybrid double quantum dot qubit
E. Ferraro, M. De Michielis, G. Mazzeo +2
Quantum dot hybrid qubits formed from three electrons in double quantum dots represent a promising compromise between high speed and simple fabrication for solid state implementati…
Effective Hamiltonian for two interacting double-dot exchange-only qubits and their controlled-NOT operations
E. Ferraro, M. De Michielis, M. Fanciulli +1
Double-dot exchange-only qubit represents a promising compromise between high speed and simple fabrication in solid-state implementations. A couple of interacting double-dot exchan…
Entanglement sudden death and sudden birth in two uncoupled spins
E. Ferraro, A. Napoli, M. Guccione +1
We investigate the entanglement evolution of two qubits interacting with a common environment trough an Heisenberg XX mechanism. We reveal the possibility of realizing the phenomen…
Controlled-NOT gate sequences for mixed spin qubit architectures in a noisy environment
E. Ferraro, M. Fanciulli, M. De Michielis
Explicit controlled-NOT gate sequences between two qubits of different types are presented in view of applications for large-scale quantum computation. Here, the building blocks fo…
Phonon-induced relaxation and decoherence times of the hybrid qubit in silicon quantum dots
E. Ferraro, M. Fanciulli, M. De Michielis
We study theoretically the phonon-induced relaxation and decoherence processes in the hybrid qubit in silicon. Hybrid qubit behaves as a charge qubit when the detuning is close to…
W-like states of N uncoupled spins 1/2
E. Ferraro, A. Napoli, M. A. Jivulescu +1
The exact dynamics of a disordered spin star system, describing a central spin coupled to N distinguishable and non interacting spins 1/2, is reported. Exploiting their interaction…
A criterion for entanglement in two two-level systems
E. Ferraro, A. Napoli, A. Messina
We prove a necessary and sufficient condition for the occurrence of entanglement in two two-level systems, simple enough to be of experimental interest. Our results are illustrated…
Coherent Tunneling by Adiabatic Passage of an exchange-only spin qubit in a double quantum dot chain
E. Ferraro, M. De Michielis, M. Fanciulli +1
A scheme based on Coherent Tunneling by Adiabatic Passage (CTAP) of exchange-only spin qubit quantum states in a linearly arranged double quantum dot chain is demonstrated. Logical…
Non-Markovian dissipative dynamics of two coupled qubits in independent reservoirs: a comparison between exact solutions and master equation approaches
E. Ferraro, M. Scala, R. Migliore +1
The reduced dynamics of two interacting qubits coupled to two independent bosonic baths is investigated. The one-excitation dynamics is derived and compared with that based on the…
Exact dynamics of XX central spin models
M. A. Jivulescu, E. Ferraro, A. Napoli +1
The dynamical behavior of a star network of spins, wherein each of N decoupled spins interact with a central spin through non uniform Heisenberg XX interaction is exactly studied.…
Bandwidth-limited and noisy pulse sequences for single qubit operations in semiconductor spin qubits
E. Ferraro, M. De Michielis
Spin qubits are very valuable and scalable candidates in the area of quantum computation and simulation applications. In the last decades, they have been deeply investigated from a…