Becerra’s group publishes article on multiple coherent states in Journal of Optical Society of America B

Dr. Elohim Becerra Chavez’s research group recently published Implementation of a single-shot receiver for quaternary phase-shift keyed coherent states in Journal of Optical Society of America B

Measurement strategies for multiple coherent states based on single-shot measurements with photon counting can be useful for high bandwidth communications with high spectral efficiency. The quantum-optics group led by Elohim Becerra at UNM investigated implementations of optimized multi-state discrimination strategies based on single-shot measurements extending previous work to include realistic situations with noise and imperfections, which impact the achievable performance of the measurement. The implementation with noise and imperfections allows us to identify the experimental requirements to outperform the sensitivity limit of an ideal heterodyne measurement and can guide future demonstrations of these measurements with high efficiency single-photon detectors surpassing the heterodyne limit.

The full article can be found online.

Becerra Chavez article illustration

Becerra’s group publishes Low Power Light article in Nature Partner Journals

Dr. Elohim Becerra Chavez’s research group recently published Quantum measurements: surpassing conventional sensitivity limits at low powers in Nature Partner Journals

Becerra Chavez article illustration

Optimized discrimination of multiple states.

Light has intrinsic quantum noise, which limits how well we can measure it, especially at low powers, and bounds how much information we can communicate. A team led by F. Elohim Becerra at the University of New Mexico demonstrated optimized measurements for light pulses with different phases at low powers, such as those used in coherent optical communication. These optimized measurements can surpass the ultimate sensitivity limits of ideal conventional detectors, even in the presence of loss and noise encountered in realistic situations. The measurements are based on combining the input pulse with a reference field, and counting single photons in a fraction of the pulse. By analyzing the detection outcome, the reference field can be optimized to enhance the measurement’s sensitivity. Optimized measurements at low powers may lead to more-efficient optical communication in realistic environments.

The full article can be found online at npj Quantum Information 3, Article number: 43 (2017) .

New Quantum Optics track at the OSE program at UNM

OSE logo

The Optical Science and Engineering program at the University of New Mexico recently announced its new Quantum Optics track. Topics in the Quantum Optics concentration include optics, lasers, quantum optics, quantum mechanics and quantum information science. Students in the Quantum Optics track can chose from a diverse range of elective courses in Physics and Engineering including: Physics of Semiconductors, Materials and Devices, Digital Image Processing, Quantum Information Theory, Computation. This track offers students the possibility to get experience in applied and fundamental quantum optics and quantum devices, while building a strong background in quantum information.