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Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Quantum memory at nonzero temperature in a thermodynamically trivial system
Yifan Hong, Jinkang Guo, Andrew Lucas·Mar 15, 2024
Passive error correction protects logical information forever (in the thermodynamic limit) by updating the system based only on local information and few-body interactions. A paradigmatic example is the classical two-dimensional Ising model: a Metrop...
Verification of Quantum Computations without Trusted Preparations or Measurements
E. Kashefi, D. Leichtle, Luka Music +1 more·Mar 15, 2024
With the advent of delegated quantum computing as a service, verifying quantum computations is becoming a question of great importance. Existing information theoretically Secure Delegated Quantum Computing (SDQC) protocols require the client to posse...
REPQC: Reverse Engineering and Backdooring Hardware Accelerators for Post-quantum Cryptography
S. Pagliarini, Aikata Aikata, Malik Imran +1 more·Mar 14, 2024
Significant research efforts have been dedicated to designing cryptographic algorithms that are quantum-resistant. The motivation is clear: robust quantum computers, once available, will render current cryptographic standards vulnerable. Thus, we nee...
Bridging Quantum Computing and Differential Privacy: Insights into Quantum Computing Privacy
Yusheng Zhao, Hui Zhong, Xinyue Zhang +3 more·Mar 14, 2024
While quantum computing has strong potential in data-driven fields, the privacy issue of sensitive or valuable information involved in the quantum algorithm should be considered. Differential privacy (DP), which is a fundamental privacy tool widely u...
Quantum Fourier Transform Using Dynamic Circuits.
Elisa Bäumer, Vinay Tripathi, A. Seif +2 more·Mar 14, 2024
In dynamic quantum circuits, classical information from midcircuit measurements is fed forward during circuit execution. This emerging capability of quantum computers confers numerous advantages that can enable more efficient and powerful protocols b...
Stabilizer ground states for simulating quantum many-body physics: theory, algorithms, and applications
Jiace Sun, Lixue Cheng, Shi-Xin Zhang·Mar 13, 2024
Stabilizer states, which are also known as the Clifford states, have been commonly utilized in quantum information, quantum error correction, and quantum circuit simulation due to their simple mathematical structure. In this work, we apply stabilizer...
Optimal adaptation of surface-code decoders to local noise
A. Darmawan·Mar 13, 2024
Information obtained from noise characterization of a quantum device can be used in classical decoding algorithms to improve the performance of quantum error-correcting codes. Focusing on the surface code under local (i.e. single-qubit) noise, we pre...
Experimental realization of universal quantum gates and a six-qubit entangled state using a photonic quantum walk
Kanad Sengupta, S. Dinesh, K. Shafi +2 more·Mar 11, 2024
For quantum computation using photons, performing deterministic quantum gate operations is a challenge due to the probabilistic nature of the photon-photon interaction. Encoding qubits in multiple degrees-of-freedom of photons and controlling operati...
Critical quantum metrology robust against dissipation and non-adiabaticity
Jia-Hao Lü, Wen Ning, Fan Wu +6 more·Mar 7, 2024
Critical systems near quantum phase transitions were predicted to be useful for improvement of metrological precision, thanks to their ultra-sensitive response to a tiny variation of the control Hamiltonian. Despite the promising perspective, realiza...
Quantum Algorithm for Reversing Unknown Unitary Evolutions
Yuanyi Chen, Yin Mo, Yingjian Liu +2 more·Mar 7, 2024
Reversing an unknown quantum evolution is of central importance to quantum information processing and fundamental physics, yet it remains a formidable challenge as conventional methods necessitate an infinite number of queries to fully characterize t...
Highly stable power control for chip-based continuous-variable quantum key distribution system.
Yiming Bian, Yang Li, Xuesong Xu +7 more·Mar 7, 2024
Quantum key distribution allows secret key generation with information theoretical security. It can be realized with photonic integrated circuits to benefit the tiny footprints and the large-scale manufacturing capacity. Continuous-variable quantum k...
Error Correction in Dynamical Codes
Esther Xiaozhen Fu, Daniel Gottesman·Mar 7, 2024
We ask what is the general framework for a quantum error correcting code that is defined by a sequence of measurements. Recently, there has been much interest in Floquet codes and space-time codes. In this work, we define and study the distance of a ...
Complexity-Constrained Quantum Thermodynamics
Anthony Munson, N. B. T. Kothakonda, J. Haferkamp +3 more·Mar 7, 2024
Quantum complexity measures the difficulty of realizing a quantum process, such as preparing a state or implementing a unitary. We present an approach to quantifying the thermodynamic resources required to implement a process if the process’s complex...
Scrambling transition in free fermion systems induced by a single impurity
Qucheng Gao, T. Zhou, Pengfei Zhang +1 more·Mar 6, 2024
In quantum many-body systems, interactions play a crucial role in the emergence of information scrambling. When particles interact throughout the system, the entanglement between them can lead to a rapid and chaotic spreading of quantum information, ...
Parameterized quantum comb and simpler circuits for reversing unknown qubit-unitary operations
Yin Mo, Lei Zhang, Yuanyi Chen +3 more·Mar 6, 2024
Quantum combs play a vital role in characterizing and transforming quantum processes, with wide-ranging applications in quantum information processing. However, obtaining the explicit quantum circuit for the desired quantum comb remains a challenging...
An Operational Framework for Nonclassicality in Quantum Communication Networks
Brian Doolittle, Felix Leditzky, Eric Chitambar·Mar 5, 2024
Quantum resources, such as entanglement or quantum communication, offer significant communication advantages in information processing. We develop an operational framework for realizing these communication advantages in resource-constrained quantum n...
Local Quantum Search Algorithm for Random $k$-SAT with $\Omega(n^{1+\epsilon})$ Clauses
Mingyou Wu·Mar 5, 2024
The random k-SAT instances undergo a"phase transition"from being generally satisfiable to unsatisfiable as the clause number m passes a critical threshold, $r_k n$. This causes a drastic reduction in the number of satisfying assignments, shifting the...
Demonstrating Efficient and Robust Bosonic State Reconstruction via Optimized Excitation Counting
Tanjung Krisnanda, C. Fontaine, Adrian Copetudo +6 more·Mar 5, 2024
Quantum state reconstruction is an essential element in quantum information processing. However, efficient and reliable reconstruction of nontrivial quantum states in the presence of hardware imperfections can be challenging. This task is particularl...
High-rate 16-node quantum access network based on passive optical network
Ya Pan, Yiming Bian, Yang Li +12 more·Mar 5, 2024
Quantum key distribution can provide information-theoretical secure communication, which is now heading towards building the quantum secure network for real-world applications. In most built quantum secure networks, point-to-multipoint (PTMP) topolog...
Quantum Mixed-State Self-Attention Network
Fu Chen, Qinglin Zhao, Li Feng +3 more·Mar 5, 2024
Attention mechanisms have revolutionized natural language processing. Combining them with quantum computing aims to further advance this technology. This paper introduces a novel Quantum Mixed-State Self-Attention Network (QMSAN) for natural language...