Abstract
Quantum information processing requires quantum registers based on coherently interacting quantum bits. The dipolar couplings between nitrogen vacancy (NV) centres with nanometre separation makes them a potential platform for room-temperature quantum registers. The fabrication of quantum registers that consist of NV centre arrays has not advanced beyond NV pairs for several years. Further scaling up of coupled NV centres by using nitrogen implantation through nanoholes has been hampered because the shortening of the separation distance is limited by the nanohole size and ion straggling. Here, we demonstrate the implantation of C5N4Hn from an adenine ion source to achieve further scaling. Because the C5N4Hn ion may be regarded as an ideal point source, the separation distance is solely determined by straggling. We successfully demonstrate the fabrication of strongly coupled triple NV centres. Our method may be extended to fabricate small quantum registers that can perform quantum information processing at room temperature.
Highlights
Quantum information processing requires quantum registers based on coherently interacting quantum bits
The number of nitrogen vacancy (NV) centres in a spot was verified from its optically detected magnetic resonance (ODMR) spectrum
We evaluated the creation yield of the NV centres, P, which is defined as P = NNV/(nNNion) × 100 (%), where NNV and Nion are the number of NV centres and implanted ions, respectively, and nN is the number of nitrogen atoms in an ion
Summary
Quantum information processing requires quantum registers based on coherently interacting quantum bits. Quantum error correction has been shown by a hybrid quantum register that consists of an electron spin, as well as one 14N and two 13C nuclear spins[13,14] Another possible architecture is an array of NV centres, in which neighbouring electron spins are coupled by dipole–dipole interactions[15]. There is still room to improve the separation distance and coherence time owing to fabricate coherently coupled NV centres by this technique. In addition to the coherence time, the disadvantage of the low energy is a low creation yield, which is the number of created NV centres divided by the number of implanted nitrogen ions. From the point of view of coupled multiple NV centres fabrication, the optimum implantation condition considering the ion energy, targeting accuracy, coherence time, and creation yield need to be explored. The separation distance of 40 nm between the NV centres was still too large for coupling
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