0-$\pi$ qubit in one Josephson junction

• URL: http://arxiv.org/abs/2110.07516v1
• Date: Thu, 14 Oct 2021 16:37:46 GMT
• Title: 0-$\pi$ qubit in one Josephson junction
• Authors: Guo-Liang Guo, Han-Bing Leng, Yong Hu and Xin Liu
• Abstract summary: We show that the protection at the hardware level can be approached without increasing the complexity of the devices. This leads to the implementation of the parity-protected 0-$pi$ superconducting qubit with only one highly transparent superconductor-semiconductor Josephson junction.
• Score: 3.7949447480937035
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum states are usually fragile which makes quantum computation being not as stable as classical computation. Quantum correction codes can protect quantum states but need a large number of physical qubits to code a single logic qubit. Alternatively, the protection at the hardware level has been recently developed to maintain the coherence of the quantum information by using symmetries. However, it generally has to pay the expense of increasing the complexity of the quantum devices. In this work, we show that the protection at the hardware level can be approached without increasing the complexity of the devices. The interplay between the spin-orbit coupling and the Zeeman splitting in the semiconductor allows us to tune the Josephson coupling in terms of the spin degree of freedom of Cooper pairs, the hallmark of the superconducting spintronics. This leads to the implementation of the parity-protected 0-$\pi$ superconducting qubit with only one highly transparent superconductor-semiconductor Josephson junction, which makes our proposal immune from the various fabrication imperfections.

Related papers

• Strong coupling of a superconducting flux qubit to single bismuth donors [0.0]
  Single bismuth donors can coherently transfer their quantum information to a superconducting flux qubit. This superconducting device allows to connect distant spins on-demand with little impact on their coherent behavior.
  arXiv  Detail & Related papers  (2024-11-05T06:54:09Z)
• The multimode conditional quantum Entropy Power Inequality and the squashed entanglement of the extreme multimode bosonic Gaussian channels [53.253900735220796]
  Inequality determines the minimum conditional von Neumann entropy of the output of the most general linear mixing of bosonic quantum modes. Bosonic quantum systems constitute the mathematical model for the electromagnetic radiation in the quantum regime.
  arXiv  Detail & Related papers  (2024-10-18T13:59:50Z)
• Many-body quantum register for a spin qubit [31.114245664719455]
  We demonstrate a functional quantum register in a semiconductor quantum dot. Our work establishes how many-body physics can add step-change functionality to quantum devices.
  arXiv  Detail & Related papers  (2024-04-30T16:13:01Z)
• Limitations of Noisy Quantum Devices in Computational and Entangling Power [5.178527492542246]
  We show that noisy quantum devices with a circuit depth of more than $O(log n)$ provide no advantages in any quantum algorithms. We also study the maximal entanglement that noisy quantum devices can produce under one- and two-dimensional qubit connections.
  arXiv  Detail & Related papers  (2023-06-05T12:29:55Z)
• Quantum-enhanced sensing on an optical transition via emergent collective quantum correlations [0.0]
  We show how to harness scalable entanglement in an optical transition using 1D chains of up to 51 ions with state-dependent interactions that decay as a power-law function of the ion separation. We demonstrate this in a Ramsey-type interferometer, where we reduce the measurement uncertainty by $-3.2 pm 0.5$ dB below the standard quantum limit for N = 51 ions.
  arXiv  Detail & Related papers  (2023-03-19T15:41:32Z)
• Quantum process tomography of continuous-variable gates using coherent states [49.299443295581064]
  We demonstrate the use of coherent-state quantum process tomography (csQPT) for a bosonic-mode superconducting circuit. We show results for this method by characterizing a logical quantum gate constructed using displacement and SNAP operations on an encoded qubit.
  arXiv  Detail & Related papers  (2023-03-02T18:08:08Z)
• Field-deployable Quantum Memory for Quantum Networking [62.72060057360206]
  We present a quantum memory engineered to meet real-world deployment and scaling challenges. The memory technology utilizes a warm rubidium vapor as the storage medium, and operates at room temperature. We demonstrate performance specifications of high-fidelity retrieval (95%) and low operation error $(10-2)$ at a storage time of 160 $mu s$ for single-photon level quantum memory operations.
  arXiv  Detail & Related papers  (2022-05-26T00:33:13Z)
• Efficient Bipartite Entanglement Detection Scheme with a Quantum Adversarial Solver [89.80359585967642]
  Proposal reformulates the bipartite entanglement detection as a two-player zero-sum game completed by parameterized quantum circuits. We experimentally implement our protocol on a linear optical network and exhibit its effectiveness to accomplish the bipartite entanglement detection for 5-qubit quantum pure states and 2-qubit quantum mixed states.
  arXiv  Detail & Related papers  (2022-03-15T09:46:45Z)
• Moving beyond the transmon: Noise-protected superconducting quantum circuits [55.49561173538925]
  superconducting circuits offer opportunities to store and process quantum information with high fidelity. Noise-protected devices constitute a new class of qubits in which the computational states are largely decoupled from local noise channels. This Perspective reviews the theoretical principles at the heart of these new qubits, describes recent experiments, and highlights the potential of robust encoding of quantum information in superconducting qubits.
  arXiv  Detail & Related papers  (2021-06-18T18:00:13Z)
• Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain [0.0]
  We present evidence of adiabatic quantum-state transfer in semiconductor quantum-dot electron spins. Based on simulations, we estimate that the probability to correctly transfer single-spin eigenstates and two-spin singlet states can exceed 0.95.
  arXiv  Detail & Related papers  (2020-07-08T03:01:27Z)
• Conditional quantum operation of two exchange-coupled single-donor spin qubits in a MOS-compatible silicon device [48.7576911714538]
  Silicon nanoelectronic devices can host single-qubit quantum logic operations with fidelity better than 99.9%. For the spins of an electron bound to a single donor atom, introduced in the silicon by ion implantation, the quantum information can be stored for nearly 1 second. Here we demonstrate the conditional, coherent control of an electron spin qubit in an exchange-coupled pair of $31$P donors implanted in silicon.
  arXiv  Detail & Related papers  (2020-06-08T11:25:16Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.