An Externally-Synchronized Coherent Communication System Design

Andrew J. Viterbi

Hunag Chun Hui

In this paper， we introduced a system of coherent optical detection with homodyne， which implementing coherent optical communication，our own design based on the principle of coherent optical communication. IN the system, PCI6111E was useed as a data acquisition(DAQ) module. Alice and Bob’s control procedure by their computers under the LabVIEW. The synchronous detection and DAQ were carried out on the system. The signals were processed, displayed and measured. The Experimental results show that by light-synchronization and LabVIEW procedure control, each function module work together in cooperation, include Alice’s acousto-optic modulator and electro-optical modulator, Bob’s data acquisition and phase adjustment by PZT. The coherent optical information could be transitted by Alice and real-time demodulated by Bob.

G. S. Pati, Renu Tripathi, Mauricio Pulido

We demonstrate a real-time, single-shot vector magnetic measurement technique using synchronous coherent population trapping (SCPT) in an apparatus consisting of a small rubidium vapor cell. Vector modality of our magnetometer is enabled by designing a feedback system based on performing a peak-lock on a particularly strong 2ΩL magnetic resonance produced in the SCPT spectrum and compensating the external magnetic field via a three-axis field coil. With its current design, this magnetometer exhibits high sensitivities of approximately 155, 129, and 57pT/Hz in measuring the magnetic field vector components along the (x,y,z) axes. Sensitivities closer to the shot-noise limit can be achieved in the future by reducing the technical noise of our equipment and by employing a differential detection and polarization rotation measurement scheme in our system.

Shivani Massey, Shakti Raj Chopra, Akhil Gupta

To enable the next generation of wireless communication technology at the sixth-generation (6G) level, the requirement is to have a synchronization fidelity that is less than a picosecond over land, air, and space nodes. The traditional synchronization methods that rely on atomic clocks, GPS timing, or standard feedback loops are limited in performance because of jitter, propagation delay, and decoherence in ultra-dense heterogeneous environments. This exploration suggests a Quantum Echo–Assisted Synchronization Framework (QEASF) that influences quantum echo rephasing phenomena to demonstrate phase coherence and timing alignment among distributed wireless nodes. By including quantum echo-based coherence recovery into 6G timing structures, the recommend system allows ultra-reliable synchronization with the slightest energy overhead. The study aims on establishing a theoretical model of echo-assisted coherence dynamics, developing hybrid classical–quantum timing protocols, and validating them through simulation of multi-node 6G networks. The architecture bridges quantum information physics with wireless system design, enhancing for quantum-coherent wireless timing networks and next-generation ISAC (Integrated Sensing and Communication) systems.

Neeraj Subesh, Rajameenakshi Subramanian, Rajiuddin Sk +1 more