## quantum hardware

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### arranging multiple coherent qubits together

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* **[google's willow chip with "exponential by number of qubits" decoherence correction (2024)](https://blog.google/technology/research/google-willow-quantum-chip/)**

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<img src="https://github.com/user-attachments/assets/ea8853ed-d6ab-4b58-818e-d76073658d56" width="30%" align="center" />
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* **[this is what a 50-qubit quantum computer looks like](https://www.engadget.com/2018/01/09/this-is-what-a-50-qubit-quantum-computer-looks-like/)**

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### trapped ion

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* **[demonstration of the QCCD trapped-ion quantum computer architecture, by honeywell](https://www.nature.com/articles/s41586-021-03318-4)**

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### quantum annealers 

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* **[d-wave 2000Q system](https://www.dwavesys.com/d-wave-two-system)**
* **[traffic flow optimization using a quantum annealer](https://arxiv.org/abs/1708.01625)**
* **[when can quantum annealing win?](https://ai.googleblog.com/2015/12/when-can-quantum-annealing-win.html)**

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### topological quantum computers

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#### *"a 2D quantum system with anyonic excitations can be considered as a quantum computer. unitary ransformations can be performed by moving the excitations around each other. measurements can be performed by joining excitations in pairs and observing the result of fusion. such computation is fault-tolerant by its physical nature".* (Kitaev, 2008)

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* **[developing a topological qubit, by microsoft](https://cloudblogs.microsoft.com/quantum/2018/09/06/developing-a-topological-qubit/)**
* **[a. kitaev's review](https://arxiv.org/abs/0904.2771)** and **[his quintessential book](https://archive.org/details/classicalquantum0047kita)**
* **[the radical map of topological quantum computing (intro video)](https://www.youtube.com/watch?v=ihZXl33t8So)**

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<p align="center">
<img src="https://github.com/user-attachments/assets/74687db3-1fa3-4bbe-b702-0aab07b8b4cf" width="65%" align="center"/>
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