High connectivity quantum processor nodes using single-ion-qubits in rare-earth-ion-doped crystals

• URL: http://arxiv.org/abs/2111.09016v1
• Date: Wed, 17 Nov 2021 10:15:29 GMT
• Title: High connectivity quantum processor nodes using single-ion-qubits in rare-earth-ion-doped crystals
• Authors: Adam Kinos, Lars Rippe, Diana Serrano, Andreas Walther, Stefan Kr\"oll
• Abstract summary: We present two protocols for constructing quantum processor nodes in randomly doped rare-earth-ion crystals. By varying the doping concentration and the laser accessible tunability, the processor nodes can contain anywhere from a few tens to almost $1000$ qubits.
• Score: 0.519980744168714
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present two protocols for constructing quantum processor nodes in randomly doped rare-earth-ion crystals and analyze their properties. By varying the doping concentration and the accessible laser tunability, the processor nodes can contain anywhere from only a few tens to almost $1000$ qubits. Furthermore, the average number of qubits each qubit can interact with, denoted by the connectivity, can be partly tailored to lie between just a few and roughly one hundred. We also study how a limited tunability of the laser affects the results, and conclude that a tuning range of $100$ GHz limits the results to roughly $100$ qubits with around $50$ connections per qubit on average. In order to construct an even larger processor, the vision is that several of these quantum processor nodes should be connected to each other in a multi-node architecture via, e.g., optical interfaces or flying qubits in the form of light. Our results are encouraging for establishing the rare-earth-ion-based systems as a quantum computing platform with strong potential and can serve to focus the efforts within the field.

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