Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-12-13
Phys. Rev. B 71, 235332 (2005).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 3 figures
Scientific paper
10.1103/PhysRevB.71.235332
We consider charge qubits based on shallow donor electron states in silicon and coupled quantum dots in GaAs. Specifically, we study the feasibility of P$_2^+$ charge qubits in Si, focusing on single qubit properties in terms of tunnel coupling between the two phosphorus donors and qubit decoherence caused by electron-phonon interaction. By taking into consideration the multi-valley structure of the Si conduction band, we show that inter-valley quantum interference has important consequences for single-qubit operations of P$_2^+$ charge qubits. In particular, the valley interference leads to a tunnel-coupling strength distribution centered around zero. On the other hand, we find that the Si bandstructure does not dramatically affect the electron-phonon coupling and consequently, qubit coherence. We also critically compare charge qubit properties for Si:P$_2^+$ and GaAs double quantum dot quantum computer architectures.
Hu Xuedong
Koiller Belita
Sarma Sankar Das
No associations
LandOfFree
Charge qubits in semiconductor quantum computer architectures: Tunnel coupling and decoherence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Charge qubits in semiconductor quantum computer architectures: Tunnel coupling and decoherence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Charge qubits in semiconductor quantum computer architectures: Tunnel coupling and decoherence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-226442