Quantum computation with doped silicon cavities

Abstract

We propose an architecture for quantum computing involving substitutional donors in photonic-crystal silicon cavities and the optical initialization, manipulation, and detection processes already demonstrated in ion traps and other atomic systems. Our scheme leads to easily achievable requirements on the positioning of the donors and considerably simplifies the implementation of the building blocks required for the operation of silicon-based quantum computing devices, including realization of one-and two-qubit gates, initialization, and readout of the qubits. Detailed consideration of the processes involved, using state-of-the-art values for the relevant parameters, indicates that this architecture leads to errors per gate compatible with fault-tolerant quantum computation and should be useful for quantum simulations and quantum optics applications.

A photonic platform for donor spin qubits in silicon

“…Alternatively, shallow donors offer near-infrared no-phonon donor-bound-exciton transitions [11], yet these are very weak optical transitions with highly nonradiative decay [12]. Despite these limitations, proposals for optically controlling shallow donors have been made [13,14].Here we propose to exploit the electric-dipole allowed optical transitions available to 'deep' donors, such as the chalcogen double donors sulfur, selenium and tellurium [15]. In their neutral state these helium-like double donors bind two electrons, with deep binding energies (∼ 300 meV).…”

Robust electric dipole transition at microwave frequencies for nuclear spin qubits in silicon

“…Our proposal thus provides a solution to the fact that the standard (NMR) nuclear-spin transition does not naturally couple to microwave resonators. Similarly to other proposals [45][46][47][48], here it is a classical drive (B ac ) that enables coupling to a quantum field (E vac ).…”

Layer Effect on Graphene Nanoribbon Quantum Capacitance

“…1 It turns out Carbon nano-material such as Graphene are the best candidate to replace silicon. 2 3 Recently graphene considering has drawn focused due to its exceptional mechanical and electrical properties.…”