Chapter 1: Quantum hybrid sensor by NV centers in diamond Authored by Norikazu MIZUOCHI Chapter 2: Magnetic Field Sensing using Nitrogen-Vacancy Centers in Diamond Authored by Junko Ishi-Hayase and Yuichiro Matsuzaki Chapter 3: Wide-field imaging using ensembles of NV centers in diamond Authored by Shintaro Nomura Chapter 4: Collective behaviour in hybrid quantum systems Authored by Yusuke Hama, Andreas Angerer, Emi Yukawa, W. J. Munro and Kae Nemoto Chapter 5: Rare earth "non-spin-bath" crystals for hybrid quantum coupling Authored by Takehiko Tawara Chapter 6: Electron spin resonances detected by superconducting circuits Authored by Rangga P. Budoyo, Hiraku Toida, Shiro Saito Chapter 7: Quantum information and technologies with spin-based hybrid systems Authored by Yuimaru Kubo Chapter 8: Spins in silicon field-effect transistors Authored by Keiji Ono Chapter 9: Ge/Si core-shell nanowires for hybrid quantum systems Authored by Rui Wang, Jian Sun, Russell S. Deacon and Koji Ishibashi Chapter 10: Photonic quantum interfaces among different physical systems Authored by Rikizo Ikuta, Motoki Asano, Sahin K. Ozdemir, Takashi Yamamoto Chapter 11: Hybrid quantum system of photons and nuclear spins of fermionic neutral atoms in a tunable optical lattice Authored by Hideki Ozawa, Shintaro Taie, Yosuke Takasu, and Yoshiro Takahashi Chapter 12: Phonon-electron-nuclear spin hybrid systems in an electromechanical resonator Authored by Yuma Okazaki and Hiroshi Yamaguchi Chapter 13: Cavity Quantum Electrodynamics with Laser-Cooled Atoms and Optical Nanofibers Authored by Takao Aoki Chapter 14: Robust quantum sensing Authored by Yuichiro Matsuzaki Chapter 15: Transferring quantum information in hybrid quantum systems consisting of a quantum system with limited control and a quantum computer Authored by Ryosuke Sakai, Akihito Soeda, Mio Murao