We propose and study the feasibility of wireless quantum key distribution (QKD) in indoor environments. Such systems are essential providing access to developing communications networks. find a practical regime operation, where, presence external light sources loss, secret keys can be exchanged. Our findings identify trade-off between acceptable amount background receiver field view, where latter affects ease QKD system. In particular, we show that, using proper setting, provide mobility for...

We propose a low-complexity near-optimal wavelength allocation technique for quantum key distribution access networks that rely on division multiple access. Such would allow users to send and classical signals simultaneously the same optical fiber infrastructure. Users can be connected network via wireless or wired links. account background noise present in environment, as well Raman generated by channels, calculate secret generation rate channels finite-key setting. This allows us examine...

We examine the applicability of wireless indoor quantum key distribution (QKD) in hybrid quantum-classical networks. propose practical configurations that would enable access to such The proposed setups allow an user, equipped with a QKD-enabled mobile device, communicate securely remote party on other end network. QKD signals, sent through channels, are combined classical ones and over shared fiber links user. Dense wavelengthdivision multiplexing simultaneous transmission signals same...

Continuous-variable quantum key distribution (CV-QKD) with a real local oscillator (LO) experiences phase attack security challenge due to the reference pulses transmitted along signals over an unsecure channel. In this paper, on of CV-QKD LO is investigated. The performance discrete-modulated (DM) under analyzed analytically and by simulation, compared Gaussian-modulated (GM) CV-QKD. It found that such eavesdropper's, significantly reduce transmission distance for GM based CV-QKD, whereas,...

In this paper, low-complexity channel allocation methods are proposed for quantum access networks. We consider dense-wavelength-division-multiplexing passive optical network (DWDM-PON) structures that enable users to exchange secret keys, in addition data transmission. two main sources of noise such systems, Raman scattering and four-wave mixing, examine optimal different scenarios. also take into account finite-key effects the key distribution (QKD) channels. Our numerical results show...

We propose and study the feasibility of wireless quantum key distribution (QKD) in indoor environments. Such systems are essential providing access to developing communications networks. find a practical regime operation, where, presence background noise loss, secret keys can be exchanged. Our findings identify trade-off between acceptable amount receiver field view, where latter determines accessibility QKD system. In particular, we show that, with proper setting, provide mobility for users...

The finite-key effects in quantum access networks are studied. We consider a quantum-classical network where each user is equipped with certain wavelength to exchange secure keys, using key distribution techniques, and another one classical data. Users connected the central office via passive optical network. users fiber links an indoor wireless channel. investigate regimes of operation within which can be exchanged reasonable amount time. find out that by properly designing system, it...

We investigate the use of high-dimensional quantum key distribution (HD-QKD) for wireless access to hybrid quantum-classical networks. <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$d$</tex-math></inline-formula> -dimensional time-phase encoded states exchange a secret between an indoor user and central office on other end network. evaluate performance in case transmitting classical signals over same...

We examine the applicability of wireless indoor quantum key distribution (QKD) in hybrid quantum-classical networks. propose practical configurations that would enable access to such The proposed scenarios allow an user, equipped with a QKD-enabled mobile device, communicate securely remote party on other end network. QKD signals, sent through channels, are combined classical ones and over same fiber link user. Dense wavelength-division multiplexing simultaneous transmission signals fiber....

Future communications networks not only should enable massive exchange of classical bits, but also the transmission quantum bits on which many applications rely. This will be key to offering technologies in a cost-efficient way, and it encompass integration at core existing optical networks, as well access end such networks. In this work, we cover range proposals that an for one imminent technologies, i.e., distribution (QKD), by users can securely secret their cryptographic needs. include...

Optical-fiber based pulsed source of correlated photons is proposed and investigated experimentally. Characteristics operation the discussed. Single photon generation rate up to 460 000 photons/s at ~925 nm wavelength demonstrated

We investigate the use of high-dimensional quantum key distribution (HD-QKD) in wireless access to hybrid classical networks. study d-dimensional time-phase encoded states between an indoor user and central office on other end network. evaluate performance case transmitting signals over same channel by accounting for impact background noise induced Raman-scattered light QKD receiver. also take into account loss that occur environments as well finite effects our analysis. show HD-QKD system...

We compare the performance of different optical code schemes that are used in code-division multiple-access (OCDMA) systems. This is realized by considering a bidirectional OCDMA system single passive network (SPON) and multiple (MPON). Our results show Multi-Diagonal (MD) has less comparison with other codes such as Zero Cross Correlation (ZCC), Modified Quadratic Congruence (MQC) Prime (MP) code. While MD zero cross-correlation regardless increasing number users at any given weight values,...