The article "Entanglement-enhanced quantum metrology: from standard quantum limit to Heisenberg limit" by Jiahao Huang, Min Zhuang, and Chaohong Lee reviews the fundamental principles and experimental progress in using quantum entanglement to enhance measurement precision in quantum metrology. The authors discuss the theoretical foundations of quantum parameter estimation, including Fisher information, Cramér-Rao bound, and the standard quantum limit (SQL) and Heisenberg limit (HL). They explore various types of multi-particle entangled states, such as spin-squeezed states, twin-Fock states, and spin-cat states, and their preparation methods in platforms like cold atoms and trapped ions. The article also delves into interrogation and readout techniques, emphasizing the importance of nonlinear detection and interaction-based readout for precise measurements. Additionally, it covers the potential applications of entanglement-enhanced quantum sensors in atomic clocks, magnetometers, gravimeters, and gyroscopes, highlighting their high precision and sensitivity. The review concludes with a summary and outlook on the rapidly advancing field of entanglement-enhanced quantum metrology.The article "Entanglement-enhanced quantum metrology: from standard quantum limit to Heisenberg limit" by Jiahao Huang, Min Zhuang, and Chaohong Lee reviews the fundamental principles and experimental progress in using quantum entanglement to enhance measurement precision in quantum metrology. The authors discuss the theoretical foundations of quantum parameter estimation, including Fisher information, Cramér-Rao bound, and the standard quantum limit (SQL) and Heisenberg limit (HL). They explore various types of multi-particle entangled states, such as spin-squeezed states, twin-Fock states, and spin-cat states, and their preparation methods in platforms like cold atoms and trapped ions. The article also delves into interrogation and readout techniques, emphasizing the importance of nonlinear detection and interaction-based readout for precise measurements. Additionally, it covers the potential applications of entanglement-enhanced quantum sensors in atomic clocks, magnetometers, gravimeters, and gyroscopes, highlighting their high precision and sensitivity. The review concludes with a summary and outlook on the rapidly advancing field of entanglement-enhanced quantum metrology.