Robust control and optimal Rydberg states for neutral atom two-qubit
gates
- URL: http://arxiv.org/abs/2212.10159v2
- Date: Fri, 21 Apr 2023 11:45:00 GMT
- Title: Robust control and optimal Rydberg states for neutral atom two-qubit
gates
- Authors: Madhav Mohan, Robert de Keijzer, Servaas Kokkelmans
- Abstract summary: We investigate the robustness of two-qubit gates to deviations of experimental controls on a neutral atom platform utilizing Rydberg states.
We construct robust CZ gates that retain high Bell state fidelity $F > 0.999$ in the presence of significant deviations of the coupling strength to the Rydberg state.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We investigate the robustness of two-qubit gates to deviations of
experimental controls, on a neutral atom platform utilizing Rydberg states. We
construct robust CZ gates - employing techniques from quantum optimal control -
that retain high Bell state fidelity $F > 0.999$ in the presence of significant
deviations of the coupling strength to the Rydberg state. Such deviations can
arise from laser intensity noise and atomic motion in an inhomogeneous coupling
field. We also discuss methods to mitigate errors due to deviations of the
laser detuning. The designed pulses operate on timescales that are short
compared to the fundamental decay timescale set by spontaneous emission and
blackbody radiation. We account for the finite lifetime of the Rydberg state in
both the optimisation and fidelity calculations - this makes the gates
conducive to noisy intermediate-scale quantum experiments, meaning that our
protocols can reduce infidelity on near-term quantum computing devices. We
calculate physical properties associated with infidelity for strontium-88 atoms
- including lifetimes, polarisabilities and blockade strengths - and use these
calculations to identify optimal Rydberg states for our protocols, which allows
for further minimisation of infidelity.
Related papers
- Benchmarking and fidelity response theory of high-fidelity Rydberg entangling gates [0.0]
We implement the time-optimal Rydberg CZ gate, design a circuit to benchmark its fidelity, and achieve a fidelity, averaged over symmetric input states, of 0.9971(5).
We develop a fidelity response theory to efficiently predict infidelity from laser noise with non-trivial power spectral densities.
arXiv Detail & Related papers (2024-07-29T17:12:51Z) - Erasing Doppler Dephasing Error in Rydberg Quantum Gates [11.9926033152331]
A family of Rydberg two-qubit controlled-NOT gates in Rb and Cs atoms are fully robust to the Doppler dephasing error.
Our results significantly reduce atomic temperature requirements for high-fidelity quantum gates.
arXiv Detail & Related papers (2024-07-09T03:12:04Z) - Realizing fracton order from long-range quantum entanglement in programmable Rydberg atom arrays [45.19832622389592]
Storing quantum information requires battling quantum decoherence, which results in a loss of information over time.
To achieve error-resistant quantum memory, one would like to store the information in a quantum superposition of degenerate states engineered in such a way that local sources of noise cannot change one state into another.
We show that this platform also allows to detect and correct certain types of errors en route to the goal of true error-resistant quantum memory.
arXiv Detail & Related papers (2024-07-08T12:46:08Z) - Quantum error detection with noise-resilient parity-controlled gate in two-dimensional Rydberg atom arrays [0.4473518548010192]
Quantum error detection relies on precise measurement of qubit parity.
We introduce a resilient parity-controlled gate tailored for detecting quantum errors within a 2D Rydberg atom array.
arXiv Detail & Related papers (2024-05-29T23:13:57Z) - Quantum Gate Optimization for Rydberg Architectures in the Weak-Coupling
Limit [55.05109484230879]
We demonstrate machine learning assisted design of a two-qubit gate in a Rydberg tweezer system.
We generate optimal pulse sequences that implement a CNOT gate with high fidelity.
We show that local control of single qubit operations is sufficient for performing quantum computation on a large array of atoms.
arXiv Detail & Related papers (2023-06-14T18:24:51Z) - Optimal quantum control via genetic algorithms for quantum state
engineering in driven-resonator mediated networks [68.8204255655161]
We employ a machine learning-enabled approach to quantum state engineering based on evolutionary algorithms.
We consider a network of qubits -- encoded in the states of artificial atoms with no direct coupling -- interacting via a common single-mode driven microwave resonator.
We observe high quantum fidelities and resilience to noise, despite the algorithm being trained in the ideal noise-free setting.
arXiv Detail & Related papers (2022-06-29T14:34:00Z) - Error-budgeting for a controlled-phase gate with strontium-88 Rydberg
atoms [0.1465840097113565]
We study the implementation of a high fidelity controlled-phase gate in a Rydberg quantum computer.
Laser pulses shorten the time spent in the Rydberg state by 10%.
We find that an average gate fidelity above 99.9% is possible for a very conservative estimation.
arXiv Detail & Related papers (2022-02-28T15:05:18Z) - Hardware-Efficient, Fault-Tolerant Quantum Computation with Rydberg
Atoms [55.41644538483948]
We provide the first complete characterization of sources of error in a neutral-atom quantum computer.
We develop a novel and distinctly efficient method to address the most important errors associated with the decay of atomic qubits to states outside of the computational subspace.
Our protocols can be implemented in the near-term using state-of-the-art neutral atom platforms with qubits encoded in both alkali and alkaline-earth atoms.
arXiv Detail & Related papers (2021-05-27T23:29:53Z) - Fast high-fidelity single-qubit gates for flip-flop qubits in silicon [68.8204255655161]
flip-flop qubit is encoded in the states with antiparallel donor-bound electron and donor nuclear spins in silicon.
We study the multilevel system that is formed by the interacting electron and nuclear spins.
We propose an optimal control scheme that produces fast and robust single-qubit gates in the presence of low-frequency noise.
arXiv Detail & Related papers (2021-01-27T18:37:30Z) - Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings.
The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
arXiv Detail & Related papers (2020-10-21T15:37:59Z) - Optimized Geometric Quantum Computation with mesoscopic ensemble of
Rydberg Atoms [1.3124513975412255]
We propose a nonadiabatic non-Abelian geometric quantum operation scheme to realize universal quantum computation with Rydberg atoms.
We demonstrate theoretically that both the single qubit and two-qubit quantum gates can achieve high fidelities around or above 99.9% in ideal situations.
Our numerical simulations show that the average fidelity could be 99.98% for single ensemble qubit gate and 99.94% for two-qubit gate even when the Rabi frequency of the gate laser acquires 10% fluctuations.
arXiv Detail & Related papers (2020-09-08T13:11:22Z)
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.