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16 papers · 2 filters
Quantum Zeno switch for single-photon coherent transport
Lan Zhou, S. Yang, Yu-xi Liu +2
Using a dynamical quantum Zeno effect, we propose a general approach to control the coupling between a two-level system (TLS) and its surroundings, by modulating the energy level s…
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…
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…
Density functional theory and quantum computation
Frank Gaitan, Franco Nori
This paper establishes the applicability of density functional theory methods to quantum computing systems. We show that ground-state and time-dependent density functional theory c…
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…