Kim Yong-Su, Pramanik Tanumoy, Cho Young-Wook, Yang Ming, Han Sang-Wook, Lee Sang-Yun, Kang Min-Sung, Moon Sung
Opt Express. 2018 Oct 29;26(22):29539-29549. doi: 10.1364/OE.26.029539.
Bell state measurement (BSM) plays crucial roles in photonic quantum information processing. The standard linear optical BSM is based on Hong-Ou-Mandel interference where two photons meet and interfere at a beamsplitter (BS). However, a generalized two-photon interference is not based on photon-photon interaction, but interference between two-photon probability amplitudes. Therefore, it might be possible to implement BSM without interfering photons at a BS. Here, we investigate a linear optical BSM scheme which does not require two photon overlapping at a BS. By unleashing the two photon coexistence condition, it can be symmetrically divided into two parties. The symmetrically dividable property suggests an informationally symmetrical BSM between remote parties without a third party. We also present that our BSM scheme can be used for Bell state preparation between remote parties without a third party. Since our BSM scheme can be easily extended to multiple photons, it can be useful for various quantum communication applications.
贝尔态测量（BSM）在光子量子信息处理中起着至关重要的作用。标准的线性光学贝尔态测量基于Hong-Ou-Mandel干涉，即两个光子在分束器（BS）处相遇并发生干涉。然而，广义的双光子干涉并非基于光子-光子相互作用，而是基于双光子概率幅之间的干涉。因此，有可能在不使光子在分束器处发生干涉的情况下实现贝尔态测量。在此，我们研究一种不需要两个光子在分束器处重叠的线性光学贝尔态测量方案。通过解除双光子共存条件，它可以对称地分为两方。这种可对称分割的特性表明在没有第三方的情况下远程各方之间存在信息对称的贝尔态测量。我们还表明，我们的贝尔态测量方案可用于在没有第三方的情况下远程各方之间制备贝尔态。由于我们的贝尔态测量方案可以很容易地扩展到多个光子，它可用于各种量子通信应用。
