Single-experiment-detectable multipartite entanglement witness for ensemble quantum computing

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.032317· OSTI ID:20982263

Rahimi, Robabeh; Nakahara, Mikio ^[1]; SaiToh, Akira; Kitagawa, Masahiro ^[2]

---

1. Department of Physics, Kinki University, 3-4-1 Kowakae, Higashi Osaka 577-8502 (Japan)
2. Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531 (Japan)

In this paper we provide an operational method to detect multipartite entanglement in ensemble-based quantum computing. This method is based on the concept of the entanglement witness. We decompose the entanglement witness for each class of multipartite entanglement into nonlocal operations in addition to local measurements. Individual single-qubit measurements are performed simultaneously; hence complete detection of entanglement is performed in a single-run experiment. In this sense, our scheme is superior to the generally used entanglement witnesses that require a number of experiments and preparation of copies of quantum state for detection of entanglement.

• OSTI ID: 20982263
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
INFORMATION THEORY
QUANTUM COMPUTERS
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUBITS