Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Few measurement shots challenge generalization in learning to classify entanglement
L. Banchi, Jason L. Pereira, M. Zamboni·Nov 10, 2024
The ability to extract general laws from a few known examples depends on the complexity of the problem and on the amount of training data. In the quantum setting, the learner's generalization performance is further challenged by the destructive natur...
Opportunities and Challenges of Solid-State Quantum Nonlinear Optics
Abhinav Kala, David Sharp, Minho Choi +7 more·Nov 10, 2024
Nonlinear interactions between single quantum particles are at the heart of any quantum information system, including analog quantum simulation and fault-tolerant quantum computing. This remains a particularly difficult problem for photonic qubits, a...
Theory and Experimental Demonstration of Wigner Tomography of Unknown Unitary Quantum Gates
A. Devra, L. V. Damme, F. V. Ende +2 more·Nov 8, 2024
We investigate the tomography of unknown unitary quantum processes within the framework of a finite-dimensional Wigner-type representation. This representation provides a rich visualization of quantum operators by depicting them as shapes assembled a...
Scalable feedback stabilization of quantum light sources on a CMOS chip
D. Kramnik, I. Wang, Anirudh Ramesh +8 more·Nov 8, 2024
Silicon photonics could soon be used to create the vast numbers of physical qubits needed to achieve useful quantum information processing by leveraging mature complementary metal–oxide–semiconductor (CMOS) manufacturing to miniaturize optical device...
Quantum Entanglement in Dirac Dynamics via Continuous-Time Quantum Walks in a Quantum Circuit Framework
Wei-Ting Wang, Yen-Jui Chang, Ching-Ray Chang·Nov 7, 2024
We propose a Continuous-Time Quantum Walks (CTQW) model for one-dimensional Dirac dynamics simulation with higher-order approximation. Our model bridges CTQW with a discrete-time model called Dirac Cellular Automata (DCA) via Quantum Fourier Transfor...
Taming Rydberg Decay with Measurement-based Quantum Computation
Cheng-Cheng Yu, Zi-Han Chen, Yu-Hao Deng +3 more·Nov 7, 2024
Programmable neutral atom arrays show great promise for fault-tolerant quantum computing. A dominant physical error on this platform is qubit leakage and loss, notably decay errors from the Rydberg state during two-qubit gates. Such leakage events ar...
Mixing time of quantum Gibbs sampling for random sparse Hamiltonians
Akshar Ramkumar, Mehdi Soleimanifar·Nov 7, 2024
Providing evidence that quantum computers can efficiently prepare low-energy or thermal states of physically relevant interacting quantum systems is a major challenge in quantum information science. A newly developed quantum Gibbs sampling algorithm ...
Bell state generation and CNOT operation using on-demand identical photons from shape-controlled spatially ordered quantum dots
Qi Huang, Swarnabha Chattaraj, Lucas Jordao +3 more·Nov 7, 2024
Fault tolerant on-chip photonic quantum computation is enormously helped by (a) deterministic generation of the needed thousands to millions of photon qubits from (b) quantum emitters in designed spatially ordered arrays to enable networks for implem...
Harnessing quantum back-action for time-series processing
Giacomo Franceschetto, Marcin Płodzień, Maciej Lewenstein +2 more·Nov 6, 2024
Quantum measurements affect the state of the observed systems via back-action. While projective measurements extract maximal classical information, they drastically alter the system's configuration. In contrast, indirect measurements balance informat...
Exploring the quantum capacity of a Gaussian random-displacement channel using Gottesman-Kitaev-Preskill codes and maximum-likelihood decoding
Mao Lin, Kyungjoo Noh·Nov 6, 2024
Determining the quantum capacity of a noisy quantum channel is an important problem in the field of quantum communication theory. In this work, we consider the Gaussian random displacement channel $N_{\sigma}$, a type of bosonic Gaussian channels rel...
Programming an Optical Lattice Interferometer
L. M. Seifert, V. Colussi, Michael A. Perlin +2 more·Nov 6, 2024
Programming a quantum device describes the usage of quantum logic gates, agnostic of hardware specifics, to perform a sequence of operations with (typically) a computing or sensing task in mind. Such programs have been executed on digital quantum com...
Soft Reverse Reconciliation for Discrete Modulations
M. Origlia, M. Secondini·Nov 6, 2024
The performance of the information reconciliation phase is crucial for quantum key distribution (QKD). Reverse reconciliation ($\mathbf{R R}$) is typically preferred over direct reconciliation (DR) because it yields higher secure key rates. However, ...
Quantum Programmable Reflections
E. Schoute, Dmitry Grinko, Yiğit Subaşı +1 more·Nov 6, 2024
Similar to a classical processor, which is an algorithm for reading a program and executing its instructions on input data, a universal programmable quantum processor is a fixed quantum channel that reads a quantum program $\lvert\psi_{U}\rangle$ tha...
Infinitely fast critical dynamics: Teleportation through temporal rare regions in monitored quantum circuits
Gal Shkolnik, Sarang Gopalakrishnan, David A. Huse +2 more·Nov 5, 2024
We consider measurement-induced phase transitions in monitored quantum circuits with a measurement rate that fluctuates in time, remaining spatially uniform at each time. The spatially correlated fluctuations in the measurement rate disrupt the volum...
Does connected wedge imply distillable entanglement?
Takato Mori, Beni Yoshida·Nov 5, 2024
The Ryu-Takayanagi formula predicts that two boundary subsystems $A$ and $C$ can exhibit large mutual information $I(A:C)$ even when they are spatially disconnected on the boundary and separated by a buffer subsystem $B$, as long as $A$ and $C$ have ...
Gauge-fixing quantum density operators at scale
Amit Jamadagni, E. Dumitrescu·Nov 5, 2024
We provide theory, algorithms, and simulations of non-equilibrium quantum systems using a one-dimensional (1D) completely-positive (CP), matrix-product (MP) density-operator ($\rho$) representation. By generalizing the matrix product state's orthogon...
Strong coupling of a superconducting flux qubit to single bismuth donors
Tikai Chang, I. Holzman, Shao Qi Lim +4 more·Nov 5, 2024
The realization of a quantum computer represents a tremendous scientific and technological challenge due to the extreme fragility of quantum information. The physical support of information, namely the quantum bit or qubit, must at the same time be s...
Towards Entropic Constraints on Quantum Speedups
Jason Pollack, Dylan VanAllen·Nov 5, 2024
Some quantum algorithms have"quantum speedups": improved time complexity as compared with the best-known classical algorithms for solving the same tasks. Can we understand what fuels these speedups from an entropic perspective? Information theory giv...
Fast Unconditional Reset and Leakage Reduction of a Tunable Superconducting Qubit via an Engineered Dissipative Bath
Gihwan Kim, Andreas Butler, V. Ferreira +4 more·Nov 5, 2024
Rapid and accurate initialization of qubits, reset, is a crucial building block for various tasks in quantum information processing, such as quantum error-correction and estimation of statistics of noisy quantum devices with many qubits. We demonstra...
Multipartite entanglement structures in quantum stabilizer states
Vaibhav Sharma, Erich J. Mueller·Nov 4, 2024
We develop a method for visualizing the internal structure of multipartite entanglement in pure stabilizer states. Our algorithm graphically organizes the many-body correlations in a hierarchical structure. This provides a rich taxonomy from which on...