Parity-protected superconducting qubit based on topological insulators
- URL: http://arxiv.org/abs/2308.12027v1
- Date: Wed, 23 Aug 2023 09:38:48 GMT
- Title: Parity-protected superconducting qubit based on topological insulators
- Authors: Guo-Liang Guo, Han-Bing Leng and Xin Liu
- Abstract summary: topological Josephson junctions provide protection against fabrication variations.
Two 0-$pi$ qubits are constructed using the total parity odd subspace of two 0-$pi$ qubits.
Our work presents a new approach to engineer symmetry-protected superconducting qubits.
- Score: 2.9684802977324067
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We propose a novel architecture that utilizes two 0-$\pi$ qubits based on
topological Josephson junctions to implement a parity-protected superconducting
qubit. The topological Josephson junctions provides protection against
fabrication variations, which ensures the identical Josephson junctions
required to implement the0-$\pi$ qubit. By viewing the even and odd parity
ground states of a 0-$\pi$ qubit as spin-$\frac{1}{2}$ states, we construct the
logic qubit states using the total parity odd subspace of two 0-$\pi$ qubits.
This parity-protected qubit exhibits robustness against charge noise, similar
to a singlet-triplet qubit's immunity to global magnetic field fluctuations.
Meanwhile, the flux noise cannot directly couple two states with the same total
parity and therefore is greatly suppressed. Benefiting from the simultaneous
protection from both charge and flux noise, we demonstrate a dramatic
enhancement of both $T_1$ and $T_2$ coherence times. Our work presents a new
approach to engineer symmetry-protected superconducting qubits.
Related papers
- Flux-Tunable Regimes and Supersymmetry in Twisted Cuprate Heterostructures [39.58317527488534]
Two Josephson junctions are integrated in a SQuID circuit threaded by a magnetic flux.
We show that the flowermon qubit regime is maintained up to a finite critical value of the magnetic field.
The interplay between the inherent twisted d-wave nature of the order parameter and the external magnetic flux enables the implementation of different artificial atoms.
arXiv Detail & Related papers (2024-05-06T13:27:19Z) - Using bi-fluxon tunneling to protect the Fluxonium qubit [0.08426358786287626]
We study a fluxonium circuit in which the wave-functions are engineered to minimize their overlap.
Our circuit incorporates a resonant tunneling mechanism at zero external flux that couples states with the same fluxon parity.
Two-tone spectroscopy reveals the energy level structure of the circuit and the presence of $4 pi$ quantum-phase slips.
arXiv Detail & Related papers (2024-02-07T00:38:38Z) - Superconducting qubit based on twisted cuprate van der Waals
heterostructures [0.0]
VdW assembly enables the fabrication of novel Josephson junctions.
A capacitively shunted qubit called flowermon is protected against chargenoise-induced relaxation and quasi-particle dissipation.
This inherently protected qubit paves the way to a new class of high-coherence hybrid superconducting quantum devices.
arXiv Detail & Related papers (2023-08-01T21:07:11Z) - Robust engineering of maximally entangled states by identical particle
interferometry [1.7188280334580195]
We propose a procedure for the robust preparation of maximally entangled states of identical fermionic qubits.
The protocol exploits externally activated noisy channels to reset the system to a known state.
The results supply further insights towards viable strategies for noise-protected entanglement exploitable in quantum-enhanced technologies.
arXiv Detail & Related papers (2023-05-23T17:29:20Z) - Observation of Josephson Harmonics in Tunnel Junctions [0.9263754304004778]
State-of-the-art technologies, including the world's largest quantum processors, employ aluminum oxide (AlO$_x$) tunnel Josephson junctions (JJs) as sources of nonlinearity.
Here we show that the standard C$varphi$R fails to accurately describe the energy spectra of transmon artificial atoms.
By including these in the transmon Hamiltonian, we obtain orders of magnitude better agreement between the computed and measured energy spectra.
arXiv Detail & Related papers (2023-02-17T23:52:55Z) - Autonomous coherence protection of a two-level system in a fluctuating
environment [68.8204255655161]
We re-examine a scheme originally intended to remove the effects of static Doppler broadening from an ensemble of non-interacting two-level systems (qubits)
We demonstrate that this scheme is far more powerful and can also protect a single (or even an ensemble) qubit's energy levels from noise which depends on both time and space.
arXiv Detail & Related papers (2023-02-08T01:44:30Z) - Erasure qubits: Overcoming the $T_1$ limit in superconducting circuits [105.54048699217668]
amplitude damping time, $T_phi$, has long stood as the major factor limiting quantum fidelity in superconducting circuits.
We propose a scheme for overcoming the conventional $T_phi$ limit on fidelity by designing qubits in a way that amplitude damping errors can be detected and converted into erasure errors.
arXiv Detail & Related papers (2022-08-10T17:39:21Z) - Directional Josephson traveling-wave parametric amplifier via
non-Hermitian topology [58.720142291102135]
Low-noise microwave amplification is crucial for detecting weak signals in quantum technologies and radio astronomy.
Current amplifiers do not satisfy all these requirements, severely limiting the scalability of superconducting quantum devices.
Here, we demonstrate the feasibility of building a near-ideal quantum amplifier using a homogeneous Josephson junction array and the non-trivial topology of its dynamics.
arXiv Detail & Related papers (2022-07-27T18:07:20Z) - Noise-resilient Edge Modes on a Chain of Superconducting Qubits [103.93329374521808]
Inherent symmetry of a quantum system may protect its otherwise fragile states.
We implement the one-dimensional kicked Ising model which exhibits non-local Majorana edge modes (MEMs) with $mathbbZ$ parity symmetry.
MEMs are found to be resilient against certain symmetry-breaking noise owing to a prethermalization mechanism.
arXiv Detail & Related papers (2022-04-24T22:34:15Z) - Random quantum circuits anti-concentrate in log depth [118.18170052022323]
We study the number of gates needed for the distribution over measurement outcomes for typical circuit instances to be anti-concentrated.
Our definition of anti-concentration is that the expected collision probability is only a constant factor larger than if the distribution were uniform.
In both the case where the gates are nearest-neighbor on a 1D ring and the case where gates are long-range, we show $O(n log(n)) gates are also sufficient.
arXiv Detail & Related papers (2020-11-24T18:44:57Z) - Hardware-Encoding Grid States in a Non-Reciprocal Superconducting
Circuit [62.997667081978825]
We present a circuit design composed of a non-reciprocal device and Josephson junctions whose ground space is doubly degenerate and the ground states are approximate codewords of the Gottesman-Kitaev-Preskill (GKP) code.
We find that the circuit is naturally protected against the common noise channels in superconducting circuits, such as charge and flux noise, implying that it can be used for passive quantum error correction.
arXiv Detail & Related papers (2020-02-18T16:45:09Z)
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.