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22 papers · 1 filter
Weak and strong measurement of a qubit using a switching-based detector
S. Ashhab, J. Q. You, Franco Nori
We analyze the operation of a switching-based detector that probes a qubit's observable that does not commute with the qubit's Hamiltonian, leading to a nontrivial interplay betwee…
Coupling strength estimation for spin chains despite restricted access
Daniel Burgarth, Koji Maruyama, Franco Nori
Quantum control requires full knowledge of the system many-body Hamiltonian. In many cases this information is not directly available due to restricted access to the system. Here w…
Detector Backaction on the Self-Consistent Bound State in Quantum Point Contacts
Y. Yoon, M. -G. Kang, T. Morimoto +5
Bound-state (BS) formation in quantum point contacts (QPCs) may offer a convenient way to localize and probe single spins. In this letter, we investigate how such BSs are affected…
Quantum super-cavity with atomic mirrors
Lan Zhou, H. Dong, Yu-xi Liu +2
We study single-photon transport in an array of coupled microcavities where two two-level atomic systems are embedded in two separate cavities of the array. We find that a single-p…
Protecting entanglement in superconducting qubits
Jing Zhang, Yu-xi Liu, Chun-Wen Li +2
When a two-qubit system is initially maximally-entangled, two independent decoherence channels, one per qubit, would greatly reduce the entanglement of the two-qubit system when it…
Electronic properties of the armchair graphene nanoribbon
A. V. Rozhkov, S. Savel'ev, Franco Nori
We investigate the electronic band structure of an undoped graphene armchair nanoribbon. We demonstrate that such nanoribbon always has a gap in its electronic spectrum. Indeed, ev…