Implementing two-qubit gates at the quantum speed limit
arXiv:2206.07716 · doi:10.1103/PhysRevResearch.5.043194
Abstract
The speed of elementary quantum gates, particularly two-qubit gates, ultimately sets the limit on the speed at which quantum circuits can operate. In this work, we experimentally demonstrate commonly used two-qubit gates at nearly the fastest possible speed allowed by the physical interaction strength between two superconducting transmon qubits. We achieve this quantum speed limit by implementing experimental gates designed using a machine learning inspired optimal control method. Importantly, our method only requires the single-qubit drive strength to be moderately larger than the interaction strength to achieve an arbitrary two-qubit gate close to its analytical speed limit with high fidelity. Thus, the method is applicable to a variety of platforms including those with comparable single-qubit and two-qubit gate speeds, or those with always-on interactions. We expect our method to offer significant speedups for non-native two-qubit gates that are typically achieved with a long sequence of single-qubit and native two-qubit gates.
arXiv comment11 pages, 9 figures, accepted version
References in corpus (36)
- Quantum Computing in the NISQ era and beyond
- Supplementary information for "Quantum supremacy using a programmable superconducting processor"
- QuTiP: An open-source Python framework for the dynamics of open quantum systems
- Superconducting Qubits: Current State of Play
- A simple formula for the average gate fidelity of a quantum dynamical operation
- New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
- Experimental Comparison of Two Quantum Computing Architectures
- Optimal Quantum Circuits for General Two-Qubit Gates
- Optimal Creation of Entanglement Using a Two--Qubit Gate
- Quantum Simulation of Electronic Structure with Linear Depth and Connectivity
- Towards the fast scrambling conjecture
- A tunable coupling scheme for implementing high-fidelity two-qubit gates
- Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits
- Fast quantum logic gates with trapped-ion qubits
- Low Depth Quantum Simulation of Electronic Structure
- Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
- Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit
- Parametrically Activated Entangling Gates Using Transmon Qubits
- Tunable Coupling Architecture for Fixed-frequency Transmons
- Perfect quantum state transfer in a superconducting qubit chain with parametrically tunable couplings
- Demonstration of a High-Fidelity CNOT for Fixed-Frequency Transmons with Engineered ZZ Suppression
- Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
- Controllable coupling between flux qubits
- High fidelity two-qubit gates on fluxoniums using a tunable coupler
- Scaling Ion Trap Quantum Computation through Fast Quantum Gates
- Implementation of the XY interaction family with calibration of a single pulse
- Hierarchy of linear light cones with long-range interactions
- Interaction cost of non-local gates
- Fast State Transfer and Entanglement Renormalization Using Long-Range Interactions
- Error analysis in suppression of unwanted qubit interactions for a parametric gate in a tunable superconducting circuit
- Analytical approach to swift nonleaky entangling gates in superconducting qubits
- Pulsed force sequences for fast phase-insensitive quantum gates in trapped ions
- Signaling and Scrambling with Strongly Long-Range Interactions
- Overlap junctions for high coherence superconducting qubits
- Speed limits for two-qubit gates with weakly anharmonic qubits
- Microwave-based Arbitrary CPHASE Gates for Transmon Qubits
Cited by in corpus (11)
- Quantum Computing: Vision and Challenges
- Single-Atom Verification of the Optimal Trade-Off between Speed and Cost in Shortcuts to Adiabaticity
- STIRAP-Inspired Robust Gates for a Superconducting Dual-Rail Qubit
- Observation of discrete charge states of a coherent two-level system in a superconducting qubit
- Direct pulse-level compilation of arbitrary quantum logic gates on superconducting qutrits
- Minimal Time Robust Control for Two Superconducting Qubits
- Cost of Emulating a Small Quantum Annealing Problem in the Circuit-Model
- GPU-accelerated Effective Hamiltonian Calculator
- Quantum Speed Limits from Symmetries in Quantum Control
- Quantum speed limits in dephasing dynamics of a qubit system coupled to thermal environments
- Hamiltonian simulation with explicit formulas for Digital-Analog Quantum Computing