Issue |
EPL
Volume 100, Number 1, October 2012
|
|
---|---|---|
Article Number | 10007 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/100/10007 | |
Published online | 18 October 2012 |
Quantum nonlocality test by spectral joint measurements of qubits in driven cavity
1 Quantum Optoelectronics Laboratory, School of Physics and Technology, Southwest Jiaotong University Chengdu 610031, China
2 Clarendon Laboratory, University of Oxford - Parks Road, Oxford OX1 3PU, UK, EU
3 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University - Guangzhou 510275, China
4 Centre for Quantum Technologies, National University of Singapore - 3 Science Drive 2, Singapore 117543, Singapore
5 Department of Physics, National University of Singapore - 2 Science Drive 3, Singapore 117542, Singapore
(a) weilianfu@gmail.com
(b) vlatko.vedral@qubit.org
Received: 30 May 2012
Accepted: 18 September 2012
We propose a feasible approach to test quantum nonlocality with two qubits dispersively coupled to a driven cavity. Our proposal is based on spectral joint measurements of two qubits, i.e., their quantum states in the computational basis states {|kl〉, k,l = 0,1} can be measured nondestructively by detecting the steady-state transmission spectra of the driven cavity. With this kind of measurements, the existence of Bell state can be robustly confirmed instead of conventional quantum state tomography. Then this kind of measurements is further utilized to test CHSH-Bell inequality. The advantage and feasibility of our proposal are also discussed.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 42.50.Dv – Quantum state engineering and measurements / 42.50.Pq – Cavity quantum electrodynamics; micromasers
© EPLA, 2012
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