Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers. / Schrade, Constantin; Marcus, Charles M.; Gyenis, Andras.

In: PRX Quantum, Vol. 3, No. 3, 030303, 06.07.2022.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Schrade, C, Marcus, CM & Gyenis, A 2022, 'Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers', PRX Quantum, vol. 3, no. 3, 030303. https://doi.org/10.1103/PRXQuantum.3.030303

APA

Schrade, C., Marcus, C. M., & Gyenis, A. (2022). Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers. PRX Quantum, 3(3), [030303]. https://doi.org/10.1103/PRXQuantum.3.030303

Vancouver

Schrade C, Marcus CM, Gyenis A. Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers. PRX Quantum. 2022 Jul 6;3(3). 030303. https://doi.org/10.1103/PRXQuantum.3.030303

Author

Schrade, Constantin ; Marcus, Charles M. ; Gyenis, Andras. / Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers. In: PRX Quantum. 2022 ; Vol. 3, No. 3.

Bibtex

@article{8688179017b648f78ad353cc25e626ba,
title = "Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers",
abstract = "We propose a protected qubit based on a modular array of superconducting islands connected by semiconductor Josephson interferometers. The individual interferometers realize effective cos 20 elements that exchange {"}pairs of Cooper pairs{"} between the superconducting islands when gate tuned into balance and frustrated by a half-flux quantum. If a large capacitor shunts the ends of the array, the circuit forms a protected qubit because its degenerate ground states are robust to offset-charge and magnetic field fluctuations for a sizable window around zero offset charge and half-flux quantum. This protection window broadens upon increasing the number of interferometers if the individual elements are balanced. We use an effective spin model to describe the system and show that a quantum phase transition sets the critical flux value at which protection is destroyed.",
keywords = "BODY APPROXIMATION METHODS, SOLVABLE MODEL, VALIDITY",
author = "Constantin Schrade and Marcus, {Charles M.} and Andras Gyenis",
year = "2022",
month = jul,
day = "6",
doi = "10.1103/PRXQuantum.3.030303",
language = "English",
volume = "3",
journal = "PRX Quantum",
issn = "2691-3399",
publisher = "American Physical Society",
number = "3",

}

RIS

TY - JOUR

T1 - Protected Hybrid Superconducting Qubit in an Array of Gate-Tunable Josephson Interferometers

AU - Schrade, Constantin

AU - Marcus, Charles M.

AU - Gyenis, Andras

PY - 2022/7/6

Y1 - 2022/7/6

N2 - We propose a protected qubit based on a modular array of superconducting islands connected by semiconductor Josephson interferometers. The individual interferometers realize effective cos 20 elements that exchange "pairs of Cooper pairs" between the superconducting islands when gate tuned into balance and frustrated by a half-flux quantum. If a large capacitor shunts the ends of the array, the circuit forms a protected qubit because its degenerate ground states are robust to offset-charge and magnetic field fluctuations for a sizable window around zero offset charge and half-flux quantum. This protection window broadens upon increasing the number of interferometers if the individual elements are balanced. We use an effective spin model to describe the system and show that a quantum phase transition sets the critical flux value at which protection is destroyed.

AB - We propose a protected qubit based on a modular array of superconducting islands connected by semiconductor Josephson interferometers. The individual interferometers realize effective cos 20 elements that exchange "pairs of Cooper pairs" between the superconducting islands when gate tuned into balance and frustrated by a half-flux quantum. If a large capacitor shunts the ends of the array, the circuit forms a protected qubit because its degenerate ground states are robust to offset-charge and magnetic field fluctuations for a sizable window around zero offset charge and half-flux quantum. This protection window broadens upon increasing the number of interferometers if the individual elements are balanced. We use an effective spin model to describe the system and show that a quantum phase transition sets the critical flux value at which protection is destroyed.

KW - BODY APPROXIMATION METHODS

KW - SOLVABLE MODEL

KW - VALIDITY

U2 - 10.1103/PRXQuantum.3.030303

DO - 10.1103/PRXQuantum.3.030303

M3 - Journal article

VL - 3

JO - PRX Quantum

JF - PRX Quantum

SN - 2691-3399

IS - 3

M1 - 030303

ER -

ID: 315393061