auto switch for large qubit measurement

Author: refraction-ray

README.md

@@ -37,9 +37,11 @@ Please begin with [Quick Start](/docs/source/quickstart.rst) in the [full docume
 
 For more information on software usage, sota algorithm implementation and engineer paradigm demonstration, please refer to 70+ [example scripts](/examples) and 30+ [tutorial notebooks](https://tensorcircuit-ng.readthedocs.io/en/latest/#tutorials). API docstrings and test cases in [tests](/tests) are also informative.
 
+For beginners, please refer to [quantum computing lectures with TC-NG](https://github.com/sxzgroup/qc_lecture) to learn both quantum computing basis and representative usage of TensorCircuit-NG.
+
 The following are some minimal demos.
 
-- Circuit manipulation:
+- Circuit construction:
 
 ```python
 import tensorcircuit as tc
@@ -60,7 +62,7 @@ tc.set_dtype("complex128")
 tc.set_contractor("greedy")
 ```
 
-- Automatic differentiations with jit:
+- Automatic differentiation with jit:
 
 ```python
 def forward(theta):

README_cn.md

@@ -33,6 +33,8 @@ TensorCircuit-NG 现在支持真实量子硬件连接和实验，并提供优雅
 
 有关软件用法，算法实现和工程范式演示的更多信息和介绍，请参阅 70+ [示例脚本](/examples) 和 30+ [案例教程](https://tensorcircuit-ng.readthedocs.io/en/latest/#tutorials)。 [测试](/tests) 用例和 API docstring 也提供了丰富的使用信息。
 
+初学者也可以参考[量子计算教程](https://github.com/sxzgroup/qc_lecture)学习量子计算基础和 TensorCircuit-NG 的典型用法.
+
 以下是一些最简易的演示。
 
 - 电路操作:

tensorcircuit/basecircuit.py

@@ -616,6 +616,8 @@ def perfect_sampling(key: Any) -> Any:
                 if batch is None:
                     r = r[0]  # type: ignore
                 return r
+        if self._nqubits > 35:
+            jittable = False
         return sample2all(sample=ch, n=self._nqubits, format=format, jittable=jittable)
 
     def sample_expectation_ps(