TY - JOUR
T1 - Spin amplification in an inhomogeneous system
AU - Endo, Suguru
AU - Matsuzaki, Yuichiro
AU - Munro, William J.
AU - Koike, Tatsuhiko
AU - Saito, Shiro
N1 - Publisher Copyright:
© 2015 The Physical Society of Japan.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/10/15
Y1 - 2015/10/15
N2 - A long-lived qubit is usually well-isolated from all other systems and the environments, and so is not easy to couple with measurement apparatus. It is sometimes difficult to implement reliable projective measurements on such a qubit. One potential solution is spin amplification with many ancillary qubits. Here, we propose a spin amplification technique, where the ancillary qubits state changes depending on the state of the target qubit. The technique works even for an inhomogeneous system. We show that fast and accurate amplification is possible even if the coupling and frequency of the ancillary qubits is inhomogeneous. Since our scheme is robust against realistic imperfections, this could provide a new mechanism for reading out a single spin that could not have been measured using the previous approaches.
AB - A long-lived qubit is usually well-isolated from all other systems and the environments, and so is not easy to couple with measurement apparatus. It is sometimes difficult to implement reliable projective measurements on such a qubit. One potential solution is spin amplification with many ancillary qubits. Here, we propose a spin amplification technique, where the ancillary qubits state changes depending on the state of the target qubit. The technique works even for an inhomogeneous system. We show that fast and accurate amplification is possible even if the coupling and frequency of the ancillary qubits is inhomogeneous. Since our scheme is robust against realistic imperfections, this could provide a new mechanism for reading out a single spin that could not have been measured using the previous approaches.
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U2 - 10.7566/JPSJ.84.103001
DO - 10.7566/JPSJ.84.103001
M3 - Article
AN - SCOPUS:84941793046
VL - 84
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 10
M1 - 103001
ER -