21 citations · 54 across the 24 of their papers we have counts for
24 papers
Practical Low-Weight Codes for Energy-Efficient Bus Encoding
Lorenzo Valentini, Marco Chiani
We consider the transmission of data encoded into binary messages, with the goal of minimizing the Hamming distance, i.e., the number of bit-flips, between consecutive messages. Th…
Performance Limits of Fault-Tolerant Quantum Error Correction Schemes
Lorenzo Valentini, Diego Forlivesi, Marco Chiani
Quantum error correction (QEC) is essential for realizing scalable quantum computation. However, when evaluating its benefits, most analyses assume idealized components, overlookin…
Fault-Tolerant Cut-Cat State Syndrome Extraction for Quantum Codes
Diego Forlivesi, Lorenzo Valentini, Marco Chiani
Reliable quantum computation requires fault-tolerant protocols to prevent errors from propagating during syndrome extraction in quantum error correction. We present a novel fault-t…
Dimensioning of Quantum Memories for Distilled Quantum EPR Packets
Lorenzo Valentini, Diego Forlivesi, Andrea Talarico +1
The quantum Internet envisions a network where information is transmitted through entanglement, with Einstein-Podolsky-Rosen (EPR) pairs serving as one of the fundamental carriers.…
Restart Belief: A General Quantum LDPC Decoder
Lorenzo Valentini, Diego Forlivesi, Andrea Talarico +1
Hardware-friendly quantum low-density parity-check (QLDPC) decoders are commonly built upon belief propagation (BP) processing. Yet, quantum degeneracy often prevents BP from achie…
Bubble Clustering Decoder for Quantum Topological Codes
Diego Forlivesi, Lorenzo Valentini, Marco Chiani
Quantum computers are highly vulnerable to noise, necessitating the use of error-correcting codes to protect stored data. Errors must be continuously corrected over time to counter…
Cylindrical and Möbius Quantum Codes for Asymmetric Pauli Errors
Lorenzo Valentini, Diego Forlivesi, Marco Chiani
In the implementation of quantum information systems, one type of Pauli error, such as phase-flip errors, may occur more frequently than others, like bit-flip errors. For this reas…
Quantum codes for asymmetric channels: ZZZY surface codes
Diego Forlivesi, Lorenzo Valentini, Marco Chiani
We introduce surface ZZZY codes, a novel family of quantum error-correcting codes designed for asymmetric channels. Derived from standard surface codes through tailored modificatio…
Spanning Tree Matching Decoder for Quantum Surface Codes
Diego Forlivesi, Lorenzo Valentini, Marco Chiani
We introduce the spanning tree matching (STM) decoder for surface codes, which guarantees the error correction capability up to the code's designed distance by first employing an i…
Logical Error Rates of XZZX and Rotated Quantum Surface Codes
Diego Forlivesi, Lorenzo Valentini, Marco Chiani
Surface codes are versatile quantum error-correcting codes known for their planar geometry, making them ideal for practical implementations. While the original proposal used Pauli…
Exploiting Pilot Mixtures in Coded Random Access
Lorenzo Valentini, Elena Bernardi, Enrico Paolini
The construction of preamble sequences for channel estimation by superposition of orthogonal pilots can improve performance of massive grant-free uplink from machine-type devices.…
Heterogeneous radio access with multiple latency targets
Israel Leyva-Mayorga, Jose Manuel Gimenez-Guzman, Lorenzo Valentini +1
Since the advent of ultra-reliable and low-latency communications (URLLC), the requirements of low-latency applications tend to be completely characterized by a single pre-defined…
Quantum Two-Way Protocol Beyond Superdense Coding: Joint Transfer of Data and Entanglement
Lorenzo Valentini, Kristian Skafte Jensen, René Bødker Christensen +2
In this article, we introduce a generalization of one-way superdense coding to two-way communication protocols for transmitting classical bits by using entangled quantum pairs. The…
Interference Cancellation Algorithms for Grant-Free Multiple Access with Massive MIMO
Lorenzo Valentini, Marco Chiani, Enrico Paolini
In next generation Internet-of-Things, the overhead introduced by grant-based multiple access protocols may engulf the access network as a consequence of the unprecedented number o…
Performance Analysis of Quantum CSS Error-Correcting Codes via MacWilliams Identities
Diego Forlivesi, Lorenzo Valentini, Marco Chiani
We analyze the performance of quantum stabilizer codes, one of the most important classes for practical implementations, on both symmetric and asymmetric quantum channels. To this…
Reliable Quantum Communications based on Asymmetry in Distillation and Coding
Lorenzo Valentini, René Bødker Christensen, Petar Popovski +1
The reliable provision of entangled qubits is an essential precondition in a variety of schemes for distributed quantum computing. This is challenged by multiple nuisances, such as…
An Implementation of the Optimal Scheme for Energy Efficient Bus Encoding
Lorenzo Valentini, Marco Chiani
In computer system buses, most of the energy is spent to change the voltage of each line from high to low or vice versa. Bus encoding schemes aim to improve energy efficiency by li…
Performance Analysis of Quantum Error-Correcting Surface Codes over Asymmetric Channels
Lorenzo Valentini, Diego Forlivesi, Marco Chiani
One of the main challenge for an efficient implementation of quantum information technologies is how to counteract quantum noise. Quantum error correcting codes are therefore of pr…
A Joint PHY and MAC Layer Design for Coded Random Access with Massive MIMO
Lorenzo Valentini, Marco Chiani, Enrico Paolini
Grant-free access schemes are candidates to support future massive multiple access applications owing to their capability to reduce control signaling and latency. As a promising cl…
Irregular Repetition Slotted ALOHA in an Information-Theoretic Setting
Enrico Paolini, Lorenzo Valentini, Velio Tralli +1
An information-theoretic approach to irregular repetition slotted ALOHA (IRSA) is proposed. In contrast with previous works, in which IRSA analysis is conducted only based on quant…
Two-Leg Deep Space Relay Architectures: Performance, Challenges, and Perspectives
Dario Modenini, Alfredo Locarini, Lorenzo Valentini +6
In this paper, architectures for interplanetary communications that feature the use of a data relay are investigated. In the considered "two-leg" architecture, a spacecraft orbitin…
Impact of Interference Subtraction on Grant-Free Multiple Access with Massive MIMO
Lorenzo Valentini, Alberto Faedi, Marco Chiani +1
The design of highly scalable multiple access schemes is a main challenge in the evolution towards future massive machine-type communications, where reliability and latency constra…
Analysis of Pointing Loss Effects in Deep Space Optical Links
Lorenzo Valentini, Alberto Faedi, Enrico Paolini +1
Owing to the extremely narrow beams, a main issue in optical deep space communications is represented by miss-pointing errors, which may severely degrade the system performance and…
Short Codes for Quantum Channels with One Prevalent Pauli Error Type
Marco Chiani, Lorenzo Valentini
One of the main problems in quantum information systems is the presence of errors due to noise, and for this reason quantum error-correcting codes (QECCs) play a key role. While mo…