Heisenberg limited measurements with superconducting circuits

Details Heisenberg limited measurements with superconducting circuits Heisenberg limited measurements with superconducting circuits

2005-12-17

arxiv.org/abs/quant-ph/0512144v2

Physics

Quantum Physics

RevTex4, 4 pages. Accepted for publication as a Rapid Communication in Physical Review A

Scientific paper

10.1103/PhysRevA.73.040304

We describe an assembly of N superconducting qubits contained in a single-mode cavity. In the dispersive regime, the correlation between the cavity field and each qubit results in an effective interaction between qubits that can be used to dynamically generate maximally entangled states. With only collective manipulations, we show how to create maximally entangled quantum states and how to use these states to reach the Heisenberg limit in the determination of the qubit bias control parameter (gate charge for charge qubits, external magnetic flux for rf-SQUIDs).

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