Decoherence of electron spin qubits in Si-based quantum computers

Details Decoherence of electron spin qubits in Si-based quantum computers Decoherence of electron spin qubits in Si-based quantum computers

2002-03-15

arxiv.org/abs/cond-mat/0203319v2

Phys. Rev. B, 66, 035314 (2002)

Physics

Condensed Matter

Materials Science

8 figures. To appear in PRB-July 2002. Revisions include: some references added/corrected, several typos fixed, a few things c

Scientific paper

10.1103/PhysRevB.66.035314

Direct phonon spin-lattice relaxation of an electron qubit bound by a donor impurity or quantum dot in SiGe heterostructures is investigated. The aim is to evaluate the importance of decoherence from this mechanism in several important solid-state quantum computer designs operating at low temperatures. We calculate the relaxation rate $1/T_1$ as a function of [100] uniaxial strain, temperature, magnetic field, and silicon/germanium content for Si:P bound electrons. The quantum dot potential is much smoother, leading to smaller splittings of the valley degeneracies. We have estimated these splittings in order to obtain upper bounds for the relaxation rate. In general, we find that the relaxation rate is strongly decreased by uniaxial compressive strain in a SiGe-Si-SiGe quantum well, making this strain an important positive design feature. Ge in high concentrations (particularly over 85%) increases the rate, making Si-rich materials preferable. We conclude that SiGe bound electron qubits must meet certain conditions to minimize decoherence but that spin-phonon relaxation does not rule out the solid-state implementation of error-tolerant quantum computing.

Affiliated with

Also associated with

No associations

Rating

Decoherence of electron spin qubits in Si-based quantum computers 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 Decoherence of electron spin qubits in Si-based quantum computers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoherence of electron spin qubits in Si-based quantum computers will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-644005