{'fraction_non_alphanumeric': 0.030970406056434963, 'fraction_numerical': 0.006194081211286993, 'mean_word_length': 5.794392523364486, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Quantum Multiuser Communication Systems with Adaptive Feedback Measurement and Chip-Interleaved Iter-PIC Receiver

One of the most crucial challenges in large-scale quantum communication systems is how to simultaneously transmit quantum information among multiple users via a common channel. In this paper, a novel non-orthogonal iterative quantum multiuser communication system is proposed. Based on the beam splitter network (BSN), we combine the independent quantum-state signals of different users into a single transmission channel. Furthermore, using photon-number-resolving detectors (PNRDs) based quantum adaptive feedback positive operator valued measurement, a chip-interleaved quantum iterative parallel interference cancellation (Iter-PIC) multiuser detection is developed. From the simulation results, the proposed quantum multiuser communication system can easily achieve 10e-7 bit error rate (BER) performance at 42 photons per bit for 6 users transmitting simultaneously. Also, from the extrinsic information transfer trajectories (EXIT) analysis results, this quantum chip interleaved Iter-PIC system is verified to have robust and fast convergence property in tough conditions, e.g. extra low receiving signal energy and quantum mode mismatch. Moreover, we show that the throughput of proposed quantum Iter-PIC system is 66.7% higher than that of the existing quantum wavelength division multiple access (q-WDMA) communication systems.