Decoherence of up to 8-qubit entangled states in a 16-qubit superconducting quantum processor
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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 qubits 4 , 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.
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The four-qubit cat state has entanglement entropy S_GHZ = 1.
“We start by noting that the four-qubit cat state, whose rich entangled nature makes it ideal for studying decoherence and decay of quantum information, 49,51 has entanglement entropy S GHZ = 1.”
From A generative modeling approach for benchmarking and training shallow quantum circuits (2019) · cites this paper as [51]
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- Authors
- Ozaeta, A., & McMahon, P. L.
- Affiliations
- Stanford University (US)
- Corresponding author
- Ozaeta, Asier
- Venue
- Quantum Science and Technology
- Publisher
- IOP Publishing
- Published
- 2019-04-01
- Volume
- 4
- Issue
- 2
- Pages
- 025015
- ISSN
- 2058-9565 (ISSN-L)
- OpenAlex
- W2779862608
- Cited by
- 16
- References
- 22
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 3 · 2022: 1 · 2021: 4 · 2020: 3 · 2019: 2 · 2018: 1
- FWCI
- 1.15
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Quantum Science and Technology (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Keywords
- decoherence, GHZ states, entangled states, superconducting qubits, IBM Quantum Experience, qubit number scaling, uncorrelated noise, multiqubit entanglement
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