Decoherence of up to 8-qubit entangled states in a 16-qubit superconducting quantum processor
Abstract
We report on the coherence of Greenberger-Horne-Zeilinger (GHZ) states comprised of up to 8 qubits in the IBM ibmqx5 16-qubit quantum processor. In particular, we evaluate the coherence of GHZ states with N = 1, …, 8 qubits4, as a function of a delay time between state creation and measurement. We find that the decay in coherence occurs at a rate that is linear in the number of qubits. This is consistent with a model in which the dominant noise affecting the system is uncorrelated across qubits.
- Publication:
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Quantum Science and Technology
- Pub Date:
- April 2019
- DOI:
- 10.1088/2058-9565/ab13e5
- Bibcode:
- 2019QS&T....4b5015O
- Keywords:
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- quantum computing;
- ghz;
- decoherence