scholarly journals Decoupling Superconducting Qubits from the Quantum Bus/Readout Resonator to Enable Scaling

2015 ◽  
Author(s):  
Rupert M. Lewis ◽  
Michael David Henry
Keyword(s):  
Superconducting Qubits ◽  
Quantum Bus

Superconducting qubits in a flip-chip architecture

2021 ◽  
Vol 118 (23) ◽  
pp. 232602
Author(s):  
C. R. Conner ◽  
A. Bienfait ◽  
H.-S. Chang ◽  
M.-H. Chou ◽  
É. Dumur ◽  
...  
Keyword(s):  
Flip Chip ◽  
Superconducting Qubits

scholarly journals Procedure via cross-Kerr nonlinearities for encoding single logical qubit information onto four-photon decoherence-free states

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jino Heo ◽  
Seong-Gon Choi
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Photon Number ◽  
Optical Devices ◽  
Quantum Bus ◽  
Reliable Procedure ◽  
Optical Gates ◽  
Photon Loss ◽  
Decoherence Effect ◽  
Logical Qubit

AbstractWe propose a photonic procedure using cross-Kerr nonlinearities (XKNLs) to encode single logical qubit information onto four-photon decoherence-free states. In quantum information processing, a decoherence-free subspace can secure quantum information against collective decoherence. Therefore, we design a procedure employing nonlinear optical gates, which are composed of XKNLs, quantum bus beams, and photon-number-resolving measurements with linear optical devices, to conserve quantum information by encoding quantum information onto four-photon decoherence-free states (single logical qubit information). Based on our analysis in quantifying the affection (photon loss and dephasing) of the decoherence effect, we demonstrate the experimental condition to acquire the reliable procedure of single logical qubit information having the robustness against the decoherence effect.

scholarly journals Exponential suppression of bit or phase errors with cyclic error correction

Nature ◽  
2021 ◽  
Vol 595 (7867) ◽  
pp. 383-387
Author(s):  
◽  
Zijun Chen ◽  
Kevin J. Satzinger ◽  
Juan Atalaya ◽  
Alexander N. Korotkov ◽  
...  
Keyword(s):  
Error Correction ◽  
Error Detection ◽  
Fault Tolerant ◽  
Error Rates ◽  
Quantum Error Correction ◽  
Superconducting Qubits ◽  
Two Dimensional ◽  
Logical Error ◽  
Quantum Error ◽  
Logical Qubit

AbstractRealizing the potential of quantum computing requires sufficiently low logical error rates1. Many applications call for error rates as low as 10−15 (refs. 2–9), but state-of-the-art quantum platforms typically have physical error rates near 10−3 (refs. 10–14). Quantum error correction15–17 promises to bridge this divide by distributing quantum logical information across many physical qubits in such a way that errors can be detected and corrected. Errors on the encoded logical qubit state can be exponentially suppressed as the number of physical qubits grows, provided that the physical error rates are below a certain threshold and stable over the course of a computation. Here we implement one-dimensional repetition codes embedded in a two-dimensional grid of superconducting qubits that demonstrate exponential suppression of bit-flip or phase-flip errors, reducing logical error per round more than 100-fold when increasing the number of qubits from 5 to 21. Crucially, this error suppression is stable over 50 rounds of error correction. We also introduce a method for analysing error correlations with high precision, allowing us to characterize error locality while performing quantum error correction. Finally, we perform error detection with a small logical qubit using the 2D surface code on the same device18,19 and show that the results from both one- and two-dimensional codes agree with numerical simulations that use a simple depolarizing error model. These experimental demonstrations provide a foundation for building a scalable fault-tolerant quantum computer with superconducting qubits.

scholarly journals Coherent router for quantum networks with superconducting qubits

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
K. S. Christensen ◽  
S. E. Rasmussen ◽  
D. Petrosyan ◽  
N. T. Zinner
Keyword(s):  
Superconducting Qubits ◽  
Quantum Networks

scholarly journals Controllable Coherent Population Transfers in Superconducting Qubits for Quantum Computing

2008 ◽  
Vol 100 (11) ◽  
Author(s):  
L. F. Wei ◽  
J. R. Johansson ◽  
L. X. Cen ◽  
S. Ashhab ◽  
Franco Nori
Keyword(s):  
Quantum Computing ◽  
Superconducting Qubits

Thin-film aluminium for superconducting qubits

2006 ◽  
Author(s):  
A.J. Ferguson ◽  
N.A. Court ◽  
F.E. Hudson ◽  
R.G. Clark
Keyword(s):  
Thin Film ◽  
Superconducting Qubits

scholarly journals Flux-based superconducting qubits for quantum computation

2002 ◽  
Vol 372-376 ◽  
pp. 194-200 ◽  
Author(s):  
T.P. Orlando ◽  
S. Lloyd ◽  
L.S. Levitov ◽  
K.K. Berggren ◽  
M.J. Feldman ◽  
...  
Keyword(s):  
Quantum Computation ◽  
Superconducting Qubits

scholarly journals Engineering Purely Nonlinear Coupling between Superconducting Qubits Using a Quarton

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Yufeng Ye ◽  
Kaidong Peng ◽  
Mahdi Naghiloo ◽  
Gregory Cunningham ◽  
Kevin P. O’Brien
Keyword(s):  
Superconducting Qubits ◽  
Nonlinear Coupling
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