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README.md

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 [![qiskit](https://img.shields.io/badge/qiskit%20community-8A2BE2)](https://qiskit.org/ecosystem)
 
 
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 # What is qdao
 qdao is a **q**uantum **d**ata **a**ccess **o**ptimization framework. It leverages secondary storage to simulate large scale quantum circuits and minimizes the data movement between memory and secondary storage. The memory requirement of full state quantum circuit simulation grows exponentially with the number of qubits. For example, on a typical PC, simulate a circuit with more than 30 qubits can easily result in out-of-memory error. With qdao, the memory occupation of simulation is  completely under your control.