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Lower limit on the achievable temperature in resonator-based sideband cooling
M. Grajcar, S. Ashhab, J. R. Johansson +1
A resonator can be effectively used as a cooler for another linear oscillator with a much smaller frequency. A huge cooling effect, which could be used to cool a mechanical oscilla…
Interqubit coupling mediated by a high-excitation-energy quantum object
S. Ashhab, A. O. Niskanen, K. Harrabi +6
We consider a system composed of two qubits and a high-excitation-energy quantum object used to mediate coupling between the qubits. We treat the entire system quantum mechanically…
Detecting mode entanglement: The role of coherent states, superselection rules and particle statistics
S. Ashhab, Koji Maruyama, Franco Nori
We discuss the possibility of observing quantum nonlocality using the so-called mode entanglement, analyzing the differences between different types of particles in this context. W…
Quantum information processing using frequency control of impurity spins in diamond
A. M. Zagoskin, J. R. Johansson, S. Ashhab +1
Spin degrees of freedom of charged nitrogen-vacancy (NV) centers in diamond have large decoherence times even at room temperature, can be initialized and read out using optical…
Two-level systems driven by large-amplitude fields
S. Ashhab, J. R. Johansson, A. M. Zagoskin +1
We analyze the dynamics of a two-level system subject to driving by large-amplitude external fields, focusing on the resonance properties in the case of driving around the region o…
Switchable coupling for superconducting qubits using double resonance in the presence of crosstalk
S. Ashhab, Franco Nori
Several methods have been proposed recently to achieve switchable coupling between superconducting qubits. We discuss some of the main considerations regarding the feasibility of i…