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Although matter ranges widely from atoms and particles to solids, photons are predominantly confined within a physical space, such as between a pair of mirrors, for enhanced photon\u2013matter interactions known as cavity QED. Because position and momentum are canonically conjugate variables governed by Heisenberg\u2019s uncertainty principle, a fundamental question arises\u2014what if light confinement is in the not\u2010so\u2010intuitive momentum or reciprocal space? The realization of photonic bound states in the continuum (BICs) has made this exotic scenario possible. Here, we summarize the most recent advancements at this research frontier in optics and photonics, covering weak coupling, strong coupling, and nonlinear optics. We can designate such photon\u2013matter interactions enabled by reciprocal light confinement through BICs with truly open systems as reciprocal QED, which holds great promise to comprehend and extend cavity QED for optics, photonics, and related fields.<\/jats:p>","DOI":"10.1002\/nap2.70108","type":"journal-article","created":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T08:26:09Z","timestamp":1777278369000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reciprocal Quantum Electrodynamics With Bound States in the Continuum"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2108-6774","authenticated-orcid":false,"given":"Shoufeng","family":"Lan","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering Texas A&amp;M University  College Station Texas USA"},{"name":"Department of Materials Science and Engineering Texas A&amp;M University  College Station Texas USA"},{"name":"Department of Electrical and Computer Engineering Texas A&amp;M University  College Station Texas 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