Fate of the Landau-Yang theorem for twisted photons

doi:10.1088/2040-8986/ab491a

	Fate of the Landau-Yang theorem for twisted photons
	Ivanov, Igor P.1; Serbo, Valery G.2,3; Zhang, Pengming 4,5
刊名	JOURNAL OF OPTICS
	2019-11-01
卷号	21 期号:11 页码:7
关键词	Landau-Yang theorem twisted photons optical angular momentum
ISSN号	2040-8978
DOI	10.1088/2040-8986/ab491a
通讯作者	Ivanov, Igor P.(igor.ivanov@tecnico.ulisboa.pt)
英文摘要	The Landau-Yang theorem is sometimes formulated as a selection rule forbidding two real (that is, non-virtual) photons with zero total momentum to be in the state of the total angular momentum J=1. In this paper, we discuss whether the theorem itself and this particular formulation can be extended to a pair of two twisted photons, which carry orbital angular momentum with respect to their propagation direction. We point out possible sources of confusion, which may arise both from the unusual features of twisted photons and from the fact that usual proofs of the Landau-Yang theorem operate in the center of motion reference frame, which, strictly speaking, exists only for plane waves. We show with an explicit calculation that a pair of twisted photons does have a non-zero overlap with the J=1 state. What is actually forbidden is production of a spin-1 particle by such a photon pair, and in this formulation the Landau-Yang theorem is rock-solid. Although both the twisted photon pair and the spin-1 particle can exist in the J=1 state, these two systems just cannot be coupled in a gauge-invariant and Lorentz invariant manner respecting Bose symmetry.
资助项目	Institute of Modern Physics, Lanzhou, China ; Portuguese Fundacao para a Ciencia e a Tecnologia (FCT)[IF/00989/2014/CP1214/CT0004] ; Portuguese Fundacao para a Ciencia e a Tecnologia (FCT)[UID/FIS/00777/2013] ; Portuguese Fundacao para a Ciencia e a Tecnologia (FCT)[UID/FIS/00777/2019] ; Portuguese Fundacao para a Ciencia e a Tecnologia (FCT)[CERN/FIS-PAR/0004/2017] ; Portuguese Fundacao para a Ciencia e a Tecnologia (FCT)[PTDC/FIS-PAR/29436/2017] ; POCTI (FEDER) ; COMPETE ; QREN ; EU ; National Science Center, Poland, via the project Harmonia[UMO-2015/18/M/ST2/00518] ; Russian Science Foundation[17-72-20013] ; National Natural Science Foundation of China[11975320]
WOS关键词	ORBITAL ANGULAR-MOMENTUM ; BEAMS
WOS研究方向	Optics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000496496800001
资助机构	Institute of Modern Physics, Lanzhou, China ; Portuguese Fundacao para a Ciencia e a Tecnologia (FCT) ; POCTI (FEDER) ; COMPETE ; QREN ; EU ; National Science Center, Poland, via the project Harmonia ; Russian Science Foundation ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/141594]
专题	中国科学院近代物理研究所
通讯作者	Ivanov, Igor P.
作者单位	1.Univ Lisbon, Inst Super Tecn, CFTP, P-1049001 Lisbon, Portugal 2.Novosibirsk State Univ, Novosibirsk 630090, Russia 3.Sobolev Inst Math, Novosibirsk 630090, Russia 4.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China 5.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Ivanov, Igor P.,Serbo, Valery G.,Zhang, Pengming. Fate of the Landau-Yang theorem for twisted photons[J]. JOURNAL OF OPTICS,2019,21(11):7.
APA	Ivanov, Igor P.,Serbo, Valery G.,&Zhang, Pengming.(2019).Fate of the Landau-Yang theorem for twisted photons.JOURNAL OF OPTICS,21(11),7.
MLA	Ivanov, Igor P.,et al."Fate of the Landau-Yang theorem for twisted photons".JOURNAL OF OPTICS 21.11(2019):7.