We are a research group at the University of Arizona. Our research is focused on experimental aspects of quantum information processing and quantum materials for use in quantum communication, quantum computing, and quantum sensing systems. 
Our group has multiple experimental postdoc openings in the area of nonlinear and quantum optics, quantum information, and integrated devices. Interested candidates should feel free to reach out to Dr. Zhang with a CV.


September 8, 2020 Dr. Yongzhou Xue joins our group as a postdoctoral researcher. John Mack and Will Roberts join us as first-year lab rotation students. Lauren McCaffrey joins us as an undergraduate researcher. Welcome Yongzhou, John, Will, and Lauren!

September 8, 2020 Dr. Zhang will lead a $1M NSF Convergence Accelerator Phase-I project to develop quantum-internconnected optomechanical transducers for entanglement-enhanced force and inertial sensing. Our partners include Purdue University, Texas A&M University, NIST, NASA, and General Dynamics Mission Systems. Congratulations to all involved!

August 26, 2020 Our team is awarded a $115M FermiLab-led Department of Energy Superconducting Quantum Materials and Systems Center (SQMS), as part of the U.S. National Quantum Initiative. Our group will be developing novel quantum sensing technologies for SQMS.

August 4, 2020 The University of Arizona will lead a five-year $26M (with an additional five-year $24.6 million option) NSF Engineering Research Center (ERC) for Quantum Networks. The partner institutes for the new ERC include MIT, Harvard University, Yale University, and University of Chicago. Our group will build upon our INQUIRE quantum network infrastructure to lead the development of the ERC testbed at the University of Arizona, with a goal of developing enabling technologies for a quantum internet. See the news release about the new Center for Quantum Networks.

May 8, 2020 Our paper "Quantum computing with multidimensional continuous-variable cluster states in a scalable photonic platform" was published in Phys. Rev. Research. We thank our collaborator Dr. Rafael Alexander, graduate student Bo-Han Wu, and postdoc Shuai Liu for their contributions. Congratulations!

April 17, 2020 Our entangled radio-frequency photonic sensor network work is highlighted in UA News. Thank Emily Dieckman for the nice article!

April 17, 2020 Our paper "Demonstration of a Reconfigurable Entangled Radio-Frequency Photonic Sensor Network" was published in Phys. Rev. Lett. Graduate student Yi Xia and postdoc Wei Li are two co-first authors with collaborators Drs. William Clark and Darlene Hart from General Dynamics. Prof. Quntao Zhuang developed the theory framework for the experiment. Congratulations to all involved!

March 1, 2020 We received funding from the Core Facilities Pilot Program to use the Micro/Nano Fabrication Center's facilities. Thank UA's Research, Innovation, and Impact Office and Dr. Greg Book for supporting our research! 

January 20, 2020 Dr. Zhang was invited to participate in NASA's Workshop on Space Quantum Communications and Networks in UC Berkeley, to develop the roadmap to quantum communications in space. 

October 31, 2019 Our new paper "Physical-layer Supervised Learning Assisted by an Entangled Sensor Network" was published in Physical Review X. This is work in collaboration with Dr. Quntao Zhuang.

September 30, 2019 Our new paper "Wave-function engineering for spectrally uncorrelated biphotons in the telecommunication band based on a machine-learning framework" was published in Physical Review Applied. Great work – congratulations to Chaohan and all involved! 

August 28, 2019 We are awarded a new NSF grant "Collaborative Research: Programmable Chip-Scale Quantum-Photonics Platform based on Frequency-Comb Cluster-States for Multicasting Quantum Networks." This is a joint project with Dr. Chee Wei Wong's group at UCLA. Thank NSF for the continuing support on our research and thank Dr. Wong for working together on the proposal and the project!

August 1, 2019 We kicked off a new NSF-funded three-year project "Spectrally efficient high-dimensional quantum communications in an integrated quantum photonic platform" led by Dr. Ivan Djordjevic and in collaboration with Dr. Linran Fan. The objective of this project is to develop a compact platform to generate, manipulate, and detect single and entangled photons carrying high-dimensional quantum information and utilize them in quantum-communication protocols implemented over the on-campus quantum-network testbed INQUIRE.

July 9, 2019 Congratulate to our graduate student Yi Xia for receiving the Dean's Fund for Excellence scholarship awarded by the College of Optical Science. Well deserved for the excellent research work, Yi!

April 26, 2019 Our team will be giving three talks at CLEO 2019 in San Jose, CA: Chaohan will present wave function engineering based on machine learning; Yi Xia will present distributed quantum sensing enhanced by a quantum relay; and Quntao will present supervised learning enhanced by an entangled sensor network. In addition, Christos from Saikat's group will present our collaborative work on covert sensing based on floodlight illumination.

April 3, 2019 Dr. Zhang's team kicks off a new program funded by the Office of Naval Research to develop ultrasensitive nanoscale integrated quantum entanglement (UNIQUE) sensors. This program is in collaboration with Drs. Linran Fan, Saikat Guha, and Quntao Zhuang.

March 15, 2019 Reeshad Arian joins our team as an undergraduate researcher. Reeshad is a sophomore majoring in Electrical and Computer Engineering and minoring in Mathematics. Reeshad's responsibility will be developing software and hardware packages for machine learning tasks that support quantum information processing. Welcome on board Reeshad!

January 25, 2019 UA News highlights our NSF MRI interdisciplinary quantum information research and engineering (INQUIRE) project. This project is in collaboration with Profs. Ivan Djordjevic (ECE), Jennifer Barton (BIO5 Institute), Nasser Peyghambarian (Optical Sciences), and Marek Romanowski (BME).

January 18, 2019 Our paper "Repeater-enhanced distributed quantum sensing based on continuous-variable multipartite entanglement" was published in Physical Review A as an "Editor's Suggestion" article. This work is a collaboration between graduate student Yi Xia, Dr. Quntao Zhuang of UA and UC-Berkeley, Dr. William Clark of General Dynamics, and Dr. Zheshen Zhang of UA. Congratulations to all!

January 2, 2019 Dr. Shuai Liu joined our team as a postdoctoral researcher. Shuai has extensive experience in fabricating and testing integrated photonic devices. Welcome, Shuai! 

July 31, 2018 Dr. Zhang will lead a National Science Foundation (NSF) Major Research Instrumentation (MRI) program to build up a quantum network testbed at the University of Arizona for interdisciplinary quantum information research and engineering (INQUIRE). Our INQUIRE team includes Profs. J. Barton and M. Romanowski of UA's BIO5 Institute, N. Peyghambarian of Optical Sciences, and I. Djordjevic of Electrical and Computer Engineering.

The INQUIRE facility and quantum-network testbed will be comprised of entangled-photon sources and single-photon detectors connecting five major nodes over multiple buildings and disciplines including Electrical and Computer Engineering, Materials Science and Engineering, Optical Sciences, Physics, and Biomedical Engineering. The infrastructure of the INQUIRE facility and the quantum-network testbed is illustrated in the figures below.



July 1, 2018 Our team receives the Arizona Board of Regents' Innovation Fund (RIF) grant to work with Arizona State University and Northern Arizona University on the development of integrated quantum photonics platform. The collaborators for this project include Profs. N. Peyghambarian, O. Monti, N. Armstrong, and S. Guha from UA, S. Goodnick and D. Ferry from ASU, and S. Hurst from NEU.

June 30, 2018 Fengyan Yang joins our group as an undergraduate summer intern student. Fengyan is sophomore in Nankai University and will develop a framework for the simulation of nonlinear optics in integrated photonic devices. Welcome Fengyan!

June 7, 2018 Our team receives the RDI - Industry Engagement and interdisciplinary Link Student Award to collaborate with the industry on quantum technology prototype development.

June 6, 2018 Dr. Zhang was invited to give a 3-hour Tutorial on quantum communications at the Biennial Symposium on Communications in Toronto, Canada. The objective of the Tutorial is to introduce the fundamentals of quantum communications to the classical communication community for fostering interdisciplinary research.

May 21, 2018 Lucas Stolberg joins our group as an undergraduate researcher. Lucas was a student in Dr. Zhang's Numerical Methods for Materials Science and Engineering course in Fall 2017 and is currently working on building quantum-limited receivers for quantum communications and sensing applications. Welcome Lucas!

May 10, 2018 Dr. Zhang was selected by the students to receive Award for Excellence at the Student Interface, cited as "Most Supportive Junior Faculty," from the College of Engineering, the University of Arizona.

Apr 16, 2018 Our group is seeking a motivated postdoc trained in experimental quantum optics, preferably with experience in nonlinear optics in fibers or in integrated photonics, to work on quantum information processing using entangled photons. Please feel free to contact Dr. Zhang via email for more information. 

Apr 11, 2018 Our paper "Experimental quantum key distribution at 1.3 gigabit-per-second secret-key rate over a 10-dB-loss channel" was published in Quantum Science and Technology. This paper reports the first demonstration of quantum key distribution at a rate in excess of 1 Gbit/s.

Oct 1, 2017 Dr. Zhang was jointly appointed in the College of Optical Sciences.

Aug 14, 2017 Dr. Zhang joined the Department of Materials Science and Engineering at the University of Arizona as an Assistant Professor.

Jun 17, 2017 Dr. Zhang is seeking motivated graduate students and postdocs to work on experimental quantum information, nanophotonics, and quantum materials in my group at the University of Arizona. We will work in a team comprising both experimentalists and theorists. Please feel free to contact Dr. Zhang via email for more information. 

Jun 17, 2017 Dr. Zhang will be joining the University of Arizona as a junior faculty member this Fall. 

Jan 27, 2017 Our paper "Optimum mixed-state discrimination for noisy entanglement-enhanced sensing" is now published in Phys Rev. Lett.

Jan 27, 2017 Our paper "Floodlight quantum key distribution: Demonstrating a framework for high-rate secure communication" is now published in Phys. Rev. A. This paper experimentally demonstrates a new quantum-communication paradigm that yields un unprecedented communication rate of 55 Mbit/s over 10 dB channel loss. Such a rate represents a 50-fold improvement over the previous record rate of ~1 Mbit/s over the same channel loss.

Jan 3, 2017 Our paper "Optimum mixed-state discrimination for noisy entanglement-enhanced sensing" (arXiv:1609.01968) has been accepted for publication in Phys. Rev. Lett. This paper introduces the optimum receiver for robust quantum-enhanced sensing, opening the door to ultrasensitive imaging, high-precision characterization, and noninvasive detection at their ultimate limits.


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