Applicability of coupling strength estimation for linear chains of restricted access<xref rid="cpb_29_3_030305fn1" ref-type="fn">*</xref><fn id="cpb_29_3_030305fn1"><label>*</label><p>Project supported by Shanghai Sailing Program, China (Grant No. 16YF1412600) and the National Natural Science Foundation of China (Grant Nos. 11420101003, 11604347, 11827806, 11874368, and 91636105).</p></fn>

Applicability of coupling strength estimation for linear chains of restricted access**

Project supported by Shanghai Sailing Program, China (Grant No. 16YF1412600) and the National Natural Science Foundation of China (Grant Nos. 11420101003, 11604347, 11827806, 11874368, and 91636105).

Feng He^{1, 2}, Yan Tian-Min^{1, †}, Jiang Yuhai^{1, 2, 3, ‡}

Schematics of parameter estimation for a chain of N sites. Assuming that the access of the chain is restricted, only site 1, the left-most site of the chain, can be measured by the detector and all the rest (sites 2, 3,…, N) are concealed by a blackbox. Using the scheme of parameter estimation, however, all coupling strengths, J_{i, i + 1}, can be estimated if the spectral information of site 1 is available.