Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Phase transitions in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo><mml:mi mathvariant="normal">D</mml:mi></mml:mrow></mml:math> subsystem-symmetric monitored quantum circuits
Cole Kelson-Packer, A. Miyake·Jul 25, 2024
The interplay of unitary evolution and projective measurements is a modern interest in the study of many-body entanglement. On the one hand, the competition between these two processes leads to the recently discovered measurement-induced phase transi...
SHARC-VQE: Simplified Hamiltonian approach with refinement and correction enabled variational quantum eigensolver for molecular simulation.
Harshdeep Singh, Sonjoy Majumder, Sabyashachi Mishra·Jul 17, 2024
Quantum computing is finding increasingly more applications in quantum chemistry, particularly to simulate electronic structure and molecular properties of simple systems. The transformation of a molecular Hamiltonian from the fermionic space to the ...
Benchmarking the Readout of a Superconducting Qubit for Repeated Measurements.
S. Hazra, W. Dai, T. Connolly +4 more·Jul 15, 2024
Readout of superconducting qubits faces a trade-off between measurement speed and unwanted backaction on the qubit caused by the readout drive, such as T_{1} degradation and leakage out of the computational subspace. The readout is typically benchmar...
On the Efficacy of Surface Codes in Compensating for Radiation Events in Superconducting Devices
Marzio Vallero, Gioele Casagranda, Flavio Vella +1 more·Jul 15, 2024
Reliability is fundamental for developing large-scale quantum computers. Since the benefit of technological advancements to the qubit’s stability is saturating, algorithmic solutions, such as quantum error correction (QEC) codes, are needed to bridge...
Finding quantum codes via Riemannian optimization
Miguel Casanova, Kentaro Ohki, Francesco Ticozzi·Jul 11, 2024
We propose a novel optimization scheme designed to find optimally correctable subspace codes for a known quantum noise channel. To each candidate subspace code we first associate a universal recovery map, as if the code was perfectly correctable, and...
Passive Photonic CZ Gate with Two-Level Emitters in Chiral Multimode Waveguide QED
Tomás Levy-Yeyati, C. Vega, T. Ramos +1 more·Jul 8, 2024
Engineering deterministic photonic gates with simple resources is one of the long-standing challenges in photonic quantum computing. Here, we design a passive conditional gate between copropagating photons using an array of only two-level emitters. T...
Over-rotation coherent error induced by pseudotwirling of quantum gates
Tanmoy Pandit, R. Uzdin·Jul 8, 2024
Quantum error mitigation schemes (QEM) have greatly enhanced the performance of quantum computers, mostly by reducing errors caused by interactions with the environment. Nevertheless, the presence of coherence errors, typically arising from miscalibr...
Qudit Dynamical Decoupling on a Superconducting Quantum Processor.
Vinay Tripathi, Noah Goss, A. Vezvaee +3 more·Jul 5, 2024
Multilevel qudit systems are increasingly being explored as alternatives to traditional qubit systems due to their denser information storage and processing potential. However, qudits are more susceptible to decoherence than qubits due to increased l...
Determination of the current-phase relation of an InAs 2DEG Josephson junction with a microwave resonator
Zoltán Scherübl, Máté Sütő, Dávid Kóti +10 more·Jun 28, 2024
Semiconductor-superconductor hybrid nanocircuits are of high interest because of their potential applications in quantum computing. Semiconductors with strong spin-orbit coupling and large g factor are particularly attractive since they are the basic...
Stark control of plexcitonic states in incoherent quantum systems
Hira Asif, Ramazan Sahin·Jun 27, 2024
In this study, we demonstrate the coherent control of plexcitonic modes in (i) off-resonant and (ii) resonant coupled plasmon-emitter systems through the optical Stark effect (OSE). By leveraging the Stark shift in degenerate energy eigenstates of tw...
Stabilization of Kerr-cat qubits with quantum circuit refrigerator
Shumpei Masuda, Shunsuke Kamimura, Tsuyoshi Yamamoto +2 more·Jun 20, 2024
A periodically driven superconducting nonlinear resonator can implement a Kerr-cat qubit, which provides a promising route to a quantum computer with a long lifetime. However, the system is vulnerable to pure dephasing, which causes unwanted excitati...
Generalized Zeno effect and entanglement dynamics induced by fermion counting
Elias Starchl, Mark H. Fischer, L. M. Sieberer·Jun 11, 2024
We study a one-dimensional lattice system of free fermions subjected to a generalized measurement process: the system exchanges particles with its environment, but each fermion leaving or entering the system is counted. In contrast to the freezing of...
Reliable Quantum Memories with Unreliable Components
A. K. Nayak, Eric Chitambar, L. Varshney·Jun 8, 2024
Quantum memory systems are vital in quantum information processing for dependable storage and retrieval of quantum states. Inspired by classical reliability theories that synthesize reliable computing systems from unreliable components, we formalize ...
Slow and stored light via electromagnetically induced transparency using a Λ -type superconducting artificial atom
Kai-I Chu, Xiao-Cheng Lu, K-H Chiang +5 more·Jun 7, 2024
Recent progresses in Josephson-junction-based superconducting circuits have propelled quantum information processing forward. However, the lack of a metastable state in most superconducting artificial atoms hinders the development of photonic quantum...
Demonstration of Erasure Conversion in a Molecular Tweezer Array
Connor M. Holland, Yukai Lu, Samuel J. Li +2 more·Jun 4, 2024
Programmable optical tweezer arrays of molecules are an emerging platform for quantum simulation and quantum information science. For these applications, reducing and mitigating errors that arise during initial state preparation and subsequent evolut...
Decoherence of solid-state spin qubits: a computational perspective
M. Onizhuk, Giulia Galli·May 28, 2024
The usefulness of solid-state spins in quantum technologies depends on how long they can remain in a coherent superposition of quantum states. This Colloquium discusses how first-principles simulations can predict spin dynamics for different types of...
Quantum entanglement of multiple excitons in strained graphene
Gabriel P. Martins, Oleg L. Berman, G. Gumbs +1 more·May 25, 2024
We studied the effects arising from a coherent source of photons on the entanglement between excitons in a strained graphene monolayer. The graphene layer was considered to be embedded in an imperfect optical microcavity. In our investigation, we hav...
Ballast Charges for Semiconductor Spin Qubits.
Yujun Choi, J. Nichol, Edwin Barnes·May 22, 2024
Semiconductor spin qubits are an attractive platform for quantum computing, but their performance is degraded primarily by fluctuating electromagnetic environments. We introduce the concept of ballast charges, which are induced charges on the surface...
Disturbance Evaluation Circuit in Quantum Measurement
Haruki Emori, M. Ozawa, Akihisa Tomita·May 19, 2024
According to the uncertainty principle, every quantum measurement accompanies disturbance. In particular, accurate sequential measurements need the accurate control of disturbance. However, the correct role of disturbance in the uncertainty principle...
Estimating Non-Stabilizerness Dynamics Without Simulating It
Alessio Paviglianiti, Guglielmo Lami, M. Collura +1 more·May 9, 2024
We introduce the Iterative Clifford Circuit Renormalization (ICCR), a novel technique designed to efficiently handle the dynamics of non-stabilizerness (a.k.a. quantum magic) in generic quantum circuits. ICCR iteratively adjusts the starting circuit,...