Two-qubit pure state tomography by five product orthonormal bases<xref rid="cpb_27_10_100306_fn1" ref-type="fn">*</xref><fn id="cpb_27_10_100306_fn1"><label>*</label><p>Project supported partially by the National Key Research and Development Program of China (Grant No. 2016YFB1000902), the National Natural Science Foundation of China (Grant No. 61472412), and the Program for Creative Research Group of the National Natural Science Foundation of China (Grant No. 61621003).</p></fn>

Two-qubit pure state tomography by five product orthonormal bases**

Project supported partially by the National Key Research and Development Program of China (Grant No. 2016YFB1000902), the National Natural Science Foundation of China (Grant No. 61472412), and the Program for Creative Research Group of the National Natural Science Foundation of China (Grant No. 61621003).

Wang Yu^{1, 2}, Shang Yun^{1, 2, 3, 4, †}

Circuit for the projective measurement onto . Let the unknown two-qubit pure state be |ϕ⟩. We directly measure each qubit with the projective measurement {|0⟩⟨0|, |1⟩⟨1|}. The state would collapse to |00⟩, |01⟩, |10⟩, or |11⟩.