Physics – Condensed Matter – Superconductivity
Scientific paper
2009-08-13
Phys. Rev. A 81, 062325 (2010)
Physics
Condensed Matter
Superconductivity
7 pages, 4 figures, and 4 pages of supporting material
Scientific paper
10.1103/PhysRevA.81.062325
Accurate and precise detection of multi-qubit entanglement is key for the experimental development of quantum computation. Traditionally, non-classical correlations between entangled qubits are measured by counting coincidences between single-shot readouts of individual qubits. We report entanglement metrology using a single detection channel with direct access to ensemble-averaged correlations between two superconducting qubits. Following validation and calibration of this joint readout, we demonstrate full quantum tomography on both separable and highly-entangled two-qubit states produced on demand. Using a subset of the measurements required for full tomography, we perform entanglement metrology with ~95% accuracy and ~98% precision despite ~10% fidelity of single measurements. For the highly entangled states, measured Clauser-Horne-Shimony-Holt operators reach a maximum value of 2.61+/-0.04 and entanglement witnesses give a lower bound of ~88% on concurrence. In its present form, this detector will be able to resolve future improvements in the production of two-qubit entanglement and is immediately extendable to 3 or 4 qubits.
Bishop Lev S.
Chow Jerry M.
Devoret Michel H.
DiCarlo L.
Frunzio Luigi
No associations
LandOfFree
Entanglement Metrology Using a Joint Readout of Superconducting Qubits 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 Entanglement Metrology Using a Joint Readout of Superconducting Qubits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Entanglement Metrology Using a Joint Readout of Superconducting Qubits will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-701867