Joint quantum nondemolition measurements of qubits: beyond the mean-field theory

Details Joint quantum nondemolition measurements of qubits: beyond the mean-field theory Joint quantum nondemolition measurements of qubits: beyond the mean-field theory

2010-05-14

arxiv.org/abs/1005.2470v3

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

We propose an approach to nondestructively detect $N$ qubits by measuring the transmissions of a dispersively-coupled cavity. By taking into account all the cavity-qubits quantum correlations (i.e., beyond the usual coarse-grained/mean-field approximations), it is revealed that for an unknown normalized $N$-qubit state $|\psi_N>=\sum_{k=0}^{2^N-1}\beta_k|k>_N$, each detected peak in the cavity transmitted spectra marks one of the basis states $|k>_N$ and the relative height of such a peak is related to the corresponding superposed-probability $|\beta_k|^2$. Our results are able to unambiguously account for the intriguing multi-peak structures of the spectra observed in a very recent circuit-quantum-electrodynamics experiment [Phys. Rev. A {\bf 81}, 062325 (2010)] with two superconducting qubits.

Affiliated with

Also associated with

No associations

Rating

Joint quantum nondemolition measurements of qubits: beyond the mean-field theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Joint quantum nondemolition measurements of qubits: beyond the mean-field theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Joint quantum nondemolition measurements of qubits: beyond the mean-field theory will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-518916