Dephasing-insensitive quantum information storage and processing with superconducting qubits

Abstract

A central task towards building a practical quantum computer is to protect individual qubits from decoherence while retaining the ability to perform high-fidelity entangling gates involving arbitrary two qubits. Here we propose and demonstrate a dephasing-insensitive procedure for storing and processing quantum information in an all-to-all connected superconducting circuit involving multiple frequency-tunable qubits, each of which can be controllably coupled to any other through a central bus resonator. Although it is generally believed that the extra frequency tunability enhances the control freedom but induces more dephasing impact for superconducting qubits, our results show that any individual qubit can be dynamically decoupled from dephasing noise by applying a weak continuous and resonant driving field whose phase is reversed in the middle of the pulse. More importantly, we demonstrate a new method for realizing two-qubit phase gate with inherent dynamical decoupling via the combination of continuous driving and qubit-qubit swapping coupling. We find that the weak continuous driving fields not only enable the conditional dynamics essential for quantum information processing, but also protect both qubits from dephasing during the gate operation.

arXiv comment10 pages, 7 figures, and 2 tables including Supplementary

References in corpus (32)

• Decoherence Free Subspaces for Quantum Computation
• Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing
• Dynamical suppression of decoherence in two-state quantum systems
• Noiseless Quantum Codes
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Keeping a Quantum Bit Alive by Optimized $\pi$-Pulse Sequences
• Optimized Dynamical Decoupling in a Model Quantum Memory
• 1/f noise: implications for solid-state quantum information
• The Flux Qubit Revisited to Enhance Coherence and Reproducibility
• Fault-Tolerant Quantum Dynamical Decoupling
• Procedure for systematically tuning up crosstalk in the cross resonance gate
• 10-qubit entanglement and parallel logic operations with a superconducting circuit
• Decoherence-protected quantum gates for a hybrid solid-state spin register
• Extending Quantum Coherence in Diamond
• Robust dynamical decoupling for quantum computing and quantum memory
• Dynamical Decoupling of a single electron spin at room temperature
• Emulating many-body localization with a superconducting quantum processor
• Low-decoherence flux qubit
• Reducing decoherence in quantum computer memory with all quantum bits coupling to the same environment
• Robust dynamical decoupling with concatenated continuous driving
• Experimental demonstration of a resonator-induced phase gate in a multi-qubit circuit QED system
• Quantum information processing and multiatom entanglement engineering with a thermal cavity
• Robust Trapped-Ion Quantum Logic Gates by Continuous Dynamical Decoupling
• Experimental inhibition of decoherence on flying qubits via bang-bang control
• Solving Systems of Linear Equations with a Superconducting Quantum Processor
• The effect of noise correlations on randomized benchmarking
• Continuously decoupling single-qubit operations from a perturbing thermal bath of scalar bosons
• Demonstration of a dressed-state phase gate for trapped ions
• Suppression of dephasing by qubit motion in superconducting circuits
• Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator
• Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity

Cited by in corpus (29)

• Quantum computation with universal error mitigation on superconducting quantum processor
• Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits
• Deterministic entanglement swapping in a superconducting circuit
• Engineering Dynamical Sweet Spots to Protect Qubits from 1/$f$ Noise
• Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
• Variational Quantum Computation of Molecular Linear Response Properties on a Superconducting Quantum Processor
• Demonstration of dynamical control of three-level open systems with a superconducting qutrit
• Engineering, control and longitudinal readout of Floquet qubits
• Suppressing Coherent Two-Qubit Errors via Dynamical Decoupling
• Pure Dephasing of Light-Matter Systems in the Ultrastrong and Deep-Strong Coupling Regimes
• Combating fluctuations in relaxation times of fixed-frequency transmon qubits with microwave-dressed states
• Quantum information scrambling in the presence of weak and strong thermalization
• Compiling Arbitrary Single-Qubit Gates Via the Phase-Shifts of Microwave Pulses
• Protecting qudit operations from noise by continuous dynamical decoupling
• One Gate Scheme to Rule Them All: Introducing a Complex Yet Reduced Instruction Set for Quantum Computing
• Scalable evaluation of quantum-circuit error loss using Clifford sampling
• Experimental Extraction of Coherent Ergotropy and Its Energetic Cost in a Superconducting Qubit
• Logical multi-qubit entanglement with dual-rail superconducting qubits
• Protecting logical qubits with dynamical decoupling
• Robust gates with spin-locked superconducting qubits
• Learning quantum dissipation by the neural ordinary differential equation
• Experimental demonstration of spontaneous symmetry breaking with emergent multi-qubit entanglement
• Critical quantum metrology robust against dissipation and non-adiabaticity
• Vibration-Assisted Multi-Photon Resonance and Multi-Ion Excitation
• A quantum register using collective excitations in a Bose-Einstein condensate
• Characterization of non-Markovianity with maximal extractable qubit-reservoir entanglement
• Generation of bipartite mechanical cat state by performing projective Bell state measurement
• Floquet Dynamical Decoupling at Zero Bias
• Robust Oscillator-Mediated Phase Gates Driven by Low-Intensity Pulses