Abstract
Abstract The nitrogen-vacancy (NV) color center in diamond has rapidly emerged as an important solid-state system for quantum information processing. Whereas individual spin registers have been used to implement small-scale diamond quantum computing, the realization of a large-scale device requires the development of an on-chip quantum bus for transporting information between distant qubits. Here, we propose a method for coherent quantum transport of an electron and its spin state between distant NV centers. Transport is achieved by the implementation of spatial stimulated adiabatic Raman passage through the optical control of the NV center charge states and the confined conduction states of a diamond nanostructure. Our models show that, for two NV centers in a diamond nanowire, high-fidelity transport can be achieved over distances of order hundreds of nanometers in timescales of order hundreds of nanoseconds. Spatial adiabatic passage is therefore a promising option for realizing an on-chip spin quantum bus.
Highlights
Diamond-based quantum information processing (QIP) is possible due to the remarkable properties of the nitrogenvacancy (NV) defect center
We propose spatial stimulated adiabatic Raman passage (STIRAP) to realize an on-chip spin quantum bus for scalable diamond QIP devices
Our scheme considers coherent quantum transport of an electron and its spin state between two NV centers embedded in a diamond nanowire
Summary
Diamond-based quantum information processing (QIP) is possible due to the remarkable properties of the nitrogenvacancy (NV) defect center. As coupling is mediated optically rather than through the Figure 1: Design schematics for quantum transport of an electron between NV centers using STIRAP. L.M. Oberg et al.: Spin coherent quantum transport of electrons between defects in diamond 1977 manipulation of tunneling amplitudes [27], the spatially separated states are truly disconnected and there is no occupation of the intermediary space during transport. Oberg et al.: Spin coherent quantum transport of electrons between defects in diamond 1977 manipulation of tunneling amplitudes [27], the spatially separated states are truly disconnected and there is no occupation of the intermediary space during transport In this sense, it is colloquially akin to the teleportation of a massive particle.
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