11.2 Tb/s Classical Channel Coexistence With DV-QKD Over a 7-Core Multicore Fiber

Abstract

The feasibility of transmitting discrete-variable quantum key distribution channels with carrier-grade classical optical channels over multicore fibers is experimentally explored in terms of achievable quantum bit error rates, secret key rates as well as classical signal bit error rates. A coexistence transmission record of 11.2 Tb/s is achieved for the classical channels simultaneously with a DV-QKD channel over a 1 km-long 7-core multicore fiber. Coexistence over the same multicore fiber core is identified as a dominant factor for the performance of the quantum channel requiring optical bandpass filtering of 17nm for the quantum channel to avoid the effect of Raman noise. Also, counter-propagation of classical channels and quantum channels probe more tolerance to noise proliferation than co-propagation. In addition, the performance of the quantum channel is maintained when more than three cores are used for the classical channels. Furthermore, by adding a second DV-QKD channel in the multicore fiber, the simultaneous transmission of classical channels as well as the generation of quantum-secured keys of two QKD channels is achieved with an operational range of 10dB of launched power into the MCF.

Resource-efficient high-dimensional subspace teleportation with a quantum autoencoder

“…The path-encoded state in the waveguides to the polarization state in the optical fiber using a polarization rotator and splitter (PRS: see Materials and Methods). For higher-dimensional spaces, the path-encoded information can be encoded in time bin ( 47 ), orbital angular momentum ( 48 ), multicore fiber ( 49 ), or frequency information ( 50 ). The BSM outcome and the encoder settings are sent to the receiver through a classical information channel.…”

The Evolution of Quantum Key Distribution Networks: On the Road to the Qinternet

“…In [279], the QKD coexistence with classical signals was evaluated over two types of MCFs, where the impacts of inter-core crosstalk and intra-core spontaneous Raman scattering on the quantum signals engendered by high-speed classical data signals were characterized. Hugues-Salas et al [280] characterized the coexistence of 11.2 Tb/s classical channels in all cores with a quantum channel in the central core over a 1 km 7-core MCF. In addition to the experiments associated with MCF, Wang et al [281] characterized the co-propagation of QKD with a 100 Gb/s classical data channel in a weakly-coupled FMF, achieving a secret-key rate of 1.3 kbps over 86 km FMF.…”

DV-QKD Coexistence With 1.6 Tbps Classical Channels Over Hollow Core Fibre

“…The coexistence of quantum and classical channels where they are both in the same optical wavelength bands (C-band) or in different optical wavelength bands (O-band for the quantum and C-band for the classical) has been extensively studied and demonstrated in [8], [9], [14]- [16]. Coexisting the quantum and classical channels in the C-band has many advantages, such as lower fibre loss in the C-band comparing to the O-band and better compatibility with the current fibre infrastructure.…”