Abstract
In this paper, the method of adaptive measurement for qubit-state preparation developed by Jacobs is reconsidered, and an alternative scheme that works even under unknown unitary evolution of the state is shown. The key idea is that the measurement is adaptively changed so that one of the eigenstates of the measured observable is always set between the current and the target states while that eigenstate converges to the target. The most significant feature of this scheme is that the measurement strength can be taken constant, unlike in Jacobs' scheme, which eventually provides fine robustness of the controlled state against the uncertainty of the unitary evolution.
| Original language | English |
|---|---|
| Article number | 062331 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 86 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2012 Dec 27 |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
Robust adaptive measurement scheme for qubit-state preparation. / Tanaka, Saki; Yamamoto, Naoki.
In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 86, No. 6, 062331, 27.12.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Robust adaptive measurement scheme for qubit-state preparation
AU - Tanaka, Saki
AU - Yamamoto, Naoki
PY - 2012/12/27
Y1 - 2012/12/27
N2 - In this paper, the method of adaptive measurement for qubit-state preparation developed by Jacobs is reconsidered, and an alternative scheme that works even under unknown unitary evolution of the state is shown. The key idea is that the measurement is adaptively changed so that one of the eigenstates of the measured observable is always set between the current and the target states while that eigenstate converges to the target. The most significant feature of this scheme is that the measurement strength can be taken constant, unlike in Jacobs' scheme, which eventually provides fine robustness of the controlled state against the uncertainty of the unitary evolution.
AB - In this paper, the method of adaptive measurement for qubit-state preparation developed by Jacobs is reconsidered, and an alternative scheme that works even under unknown unitary evolution of the state is shown. The key idea is that the measurement is adaptively changed so that one of the eigenstates of the measured observable is always set between the current and the target states while that eigenstate converges to the target. The most significant feature of this scheme is that the measurement strength can be taken constant, unlike in Jacobs' scheme, which eventually provides fine robustness of the controlled state against the uncertainty of the unitary evolution.
UR - http://www.scopus.com/inward/record.url?scp=84871796289&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871796289&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.86.062331
DO - 10.1103/PhysRevA.86.062331
M3 - Article
VL - 86
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
SN - 1050-2947
IS - 6
M1 - 062331
ER -