In this paper, we introduce the receiver architecture for the Black Hole Explorer (BHEX) Mission, designed to reveal the photon ring of black holes. The primary instrument is a dual-polarization receiver operating over the 240-320 GHz frequency range, utilizing a Superconductor-Insulator-Superconductor (SIS) mixer. This Double-Side-Band (DSB) receiver has an intermediate frequency (IF) range of 4-12 GHz and operates at a bath temperature of 4.5 K, for optimal performance, which necessitates the integration of a cryocooler. Complementing the primary receiver is a secondary unit covering the 80-106 GHz spectrum, featuring a cryogenic low noise amplifier. This secondary receiver, affixed to the 20 K stage of the cryocooler, serves to augment the SIS receiver performance by employing the Frequency Phase Transfer technique to boost the signal-to-noise ratio at the correlator output. Together, this sophisticated receiver duo is engineered to achieve the quantum-limited sensitivity required to detect the photon ring of black holes, marking a breakthrough in astrophysical observation.
Heriot-Watt University（赫瑞-瓦特大学）；National Astronomical Observatory of Japan（日本国立天文台）；Massachusetts Institute of Technology Haystack Observatory（麻省理工学院海斯塔克天文台）；The University of Tokyo（东京大学）；Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency（宇宙科学研究所，日本宇宙航空研究开发机构）；The Graduate University for Advanced Studies, SOKENDAI（综合研究大学院大学，SOKENDAI）；Niigata University（新潟大学）；Yamaguchi University（山口大学）；Nagoya City University（名古屋市立大学）；Black Hole Initiative at Harvard University（哈佛大学黑洞倡议）；Harvard University（哈佛大学）；Toyo University（东洋大学）；Bunkyo University（文教大学）；Musashino University（武藏野大学）；National Institute of Technology, Ichinoseki College（国立工学院一关学院）；University of Arizona（亚利桑那大学）
Resolving Nearby Supermassive Black Holes with the Black Hole Explorer
Yamaguchi University（山口大学）；Heriot-Watt University（赫瑞-瓦特大学）；Massachusetts Institute of Technology Haystack Observatory（麻省理工学院海斯观测站）；National Astronomical Observatory of Japan（日本国立天文台）；Black Hole Initiative at Harvard University（哈佛大学黑洞倡议项目）
Towards direct imaging and orbital parameter estimation of supermassive black hole binaries with spaceborne VLBI
Delft University of Technology（代尔夫特理工大学）；Joint Institute for VLBI ERIC (JIVE)（甚长基线干涉测量联合研究所）；Black Hole Initiative at Harvard University（哈佛大学黑洞倡议项目）；Center for Astrophysics | Harvard & Smithsonian（哈佛-史密森尼天体物理中心）
Supermassive black hole binaries in the multi-messenger context of ground and spaceborne VLBI
Delft University of Technology（代尔夫特理工大学）；Joint Institute for VLBI ERIC (JIVE)（甚长基线干涉测量欧洲联合研究所）；Niels Bohr Institute（尼尔斯·玻尔研究所）；Space Telescope Science Institute（太空望远镜科学研究所）；Johns Hopkins University（约翰斯·霍普金斯大学）；Space Initiatives Inc（太空倡议公司）
Broadband 600- and 1200-GHz Subharmonically Pumped Schottky Diode Mixers
Omnisys Instruments AB；Chalmers University of Technology（查尔姆斯理工大学）；Low Noise Factory AB；Institute of Applied Physics, University of Bern（伯尔尼大学应用物理研究所）；EmriX Consulting AB；Department of Microtechnology and Nanoscience, Chalmers University of Technology（查尔姆斯理工大学微技术与纳米科学系）
Convolutional Neural Network for Extraction of $n = 1$ Photon Ring of Black Holes
University of California, Santa Barbara（加州大学圣塔芭芭拉分校）；Miller Institute for Basic Research in Science（米勒基础科学研究学院）；Department of Astronomy, University of California, Berkeley（加州大学伯克利分校天文学系）
