Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Distilling GHZ States using Stabilizer Codes
Narayanan Rengaswamy, Ankur Raina, Nithin Raveendran +1 more·Sep 13, 2021
Entanglement distillation is a well-studied problem in quantum information, where one typically starts with n noisy Bell pairs and distills k Bell pairs of higher fidelity. While distilling Bell pairs is the canonical setting, it is important to study...
Entanglement phases in large- N hybrid Brownian circuits with long-range couplings
S. Sahu, Shao-Kai Jian, Gregory S. Bentsen +1 more·Aug 31, 2021
We develop solvable models of large-$N$ hybrid quantum circuits on qubits and fermions with long-range power-law interactions and continuous local monitoring, which provide analytical access to the entanglement phase diagram and error-correcting prop...
Coherent Ising Machines with Optical Error Correction Circuits
S. Reifenstein, S. Kako, F. Khoyratee +2 more·Aug 16, 2021
A coherent Ising machine (CIM) comprising a network of open‐dissipative quantum oscillators with optical error correction circuits is proposed. In the proposed network, the squeezed/anti‐squeezed vacuum states of the constituent optical parametric os...
Fast universal quantum gate above the fault-tolerance threshold in silicon
A. Noiri, K. Takeda, T. Nakajima +4 more·Aug 5, 2021
Fault-tolerant quantum computers that can solve hard problems rely on quantum error correction1. One of the most promising error correction codes is the surface code2, which requires universal gate fidelities exceeding an error correction threshold o...
Heat-Driven Electron-Motion in a Nanoscale Electronic Circuit
S. Takada, G. Georgiou, E. Arrighi +8 more·Jul 20, 2021
We study the interaction between two closely spaced but electrically isolated quasi-onedimensional electrical wires by a drag experiment. In this work we experimentally demonstrate the generation of current in an unbiased (drag) wire, which results f...
Effect of quantum error correction on detection-induced coherent errors
Qinghong Yang, Dong E. Liu·Jul 19, 2021
We study the performance of quantum error correction codes(QECCs) under the detection-induced coherent error due to the imperfectness of practical implementations of stabilizer measurements, after running a quantum circuit. Considering the most promi...
Fibre polarisation state compensation in entanglement-based quantum key distribution.
Yicheng Shi, Hou Shun Poh, A. Ling +1 more·Jul 16, 2021
Quantum key distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres because the routing geometry and the birefringence of the fibre link can alter the polarisation states of the propagating photons. These ...
Floquet prethermal phase protected by U(1) symmetry on a superconducting quantum processor
C. Ying, Qi Guo, Shaowei Li +22 more·Jul 15, 2021
Periodically driven systems, or Floquet systems, exhibit many novel dynamics and interesting outof-equilibrium phases of matter. Those phases arising with the quantum systems’ symmetries, such as global U(1) symmetry, can even show dynamical stabilit...
Strain induced coupling and quantum information processing with hexagonal boron nitride quantum emitters
Fatemeh Tarighitabesh, Q. Hassanzada, M. Hadian +3 more·Jun 29, 2021
We propose an electromechanical scheme where the electronic degrees of freedom of boron vacancy color centers hosted by a hexagonal boron nitride (hBN) nanoribbon are coupled for quantum information processing. The mutual coupling of color centers is...
Algorithmic Randomness and Kolmogorov Complexity for Qubits
Tejas Bhojraj·Jun 27, 2021
Nies and Scholz defined quantum Martin-L\"of randomness (q-MLR) for states (infinite qubitstrings). We define a notion of quantum Solovay randomness and show it to be equivalent to q-MLR using purely linear algebraic methods. Quantum Schnorr randomne...
Drive-induced nonlinearities of cavity modes coupled to a transmon ancilla
Yaxing Zhang, Jacob C. Curtis, Christopher S. Wang +2 more·Jun 16, 2021
High-Q microwave cavity modes coupled to transmon ancillas provide a hardware-efficient platform for quantum computing. Due to their coupling, the cavity modes inherit finite nonlinearity from the transmons. In this paper, we theoretically and experi...
Uncorrelated problem-specific samples of quantum states from zero-mean Wishart distributions
Rui Han, Weijun Li, Shrobona Bagchi +2 more·Jun 16, 2021
Random samples of quantum states are an important resource for various tasks in quantum information science, and samples in accordance with a problem-specific distribution can be indispensable ingredients. Some algorithms generate random samples by a...
Classical algorithms and quantum limitations for maximum cut on high-girth graphs
B. Barak, Kunal Marwaha·Jun 10, 2021
We study the performance of local quantum algorithms such as the Quantum Approximate Optimization Algorithm (QAOA) for the maximum cut problem, and their relationship to that of classical algorithms. (1) We prove that every (quantum or classical) one...
Simulating a measurement-induced phase transition for trapped-ion circuits
Stefanie Czischek, G. Torlai, Sayonee Ray +2 more·Jun 7, 2021
The rise of programmable quantum devices has motivated the exploration of circuit models which could realize novel physics. A promising candidate is a class of hybrid circuits, where entangling unitary dynamics compete with disentangling measurements...
Pulse-level noisy quantum circuits with QuTiP
Boxi Li, Shahnawaz Ahmed, Sidhant Saraogi +4 more·May 20, 2021
The study of the impact of noise on quantum circuits is especially relevant to guide the progress of Noisy Intermediate-Scale Quantum (NISQ) computing. In this paper, we address the pulse-level simulation of noisy quantum circuits with the Quantum To...
Quantum imaginary time evolution steered by reinforcement learning
Chenfeng Cao, Zheng An, Shi-Yao Hou +2 more·May 18, 2021
The quantum imaginary time evolution is a powerful algorithm for preparing the ground and thermal states on near-term quantum devices. However, algorithmic errors induced by Trotterization and local approximation severely hinder its performance. Here...
Hardware-Efficient Microwave-Activated Tunable Coupling between Superconducting Qubits.
B. Mitchell, R. Naik, A. Morvan +7 more·May 12, 2021
Generating high-fidelity, tunable entanglement between qubits is crucial for realizing gate-based quantum computation. In superconducting circuits, tunable interactions are often implemented using flux-tunable qubits or coupling elements, adding cont...
Benchmarking near-term quantum computers via random circuit sampling
Yunchao Liu, M. Otten, Roozbeh Bassirianjahromi +2 more·May 11, 2021
The increasing scale of near-term quantum hardware motivates the need for efficient noise characterization methods, since qubit and gate level techniques cannot capture crosstalk and correlated noise in many qubit systems. While scalable approaches, ...
Assessing the Nature of Chiral-Induced Spin Selectivity by Magnetic Resonance
A. Chiesa, M. Chizzini, E. Garlatti +8 more·May 5, 2021
Understanding chiral-induced spin selectivity (CISS), resulting from charge transport through helical systems, has recently inspired many experimental and theoretical efforts but is still the object of intense debate. In order to assess the nature of...
Switching between relaxation hotspots and coldspots in disordered spin qubits
A. Hosseinkhani, G. Burkard·May 3, 2021
We develop a valley-dependent envelope function theory that can describe the effects of arbitrary configurations of interface steps and miscuts on the qubit relaxation time. For a given interface roughness, we show how our theory can be used to find ...