Experimental realization of a 218-ion multi-qubit quantum memory

Abstract

Storage lifetime and capacity are two important factors to characterize the performance of a quantum memory. Here we report the stable trapping of above 200 ions in a cryogenic setup, and demonstrate the combination of the multi-qubit capacity and long storage lifetime by measuring the coherence time of randomly chosen ions to be on the order of hundreds of milliseconds. We apply composite microwave pulses to manipulate qubit states globally for efficient characterization of different storage units simultaneously, and we compare the performance of the quantum memory with and without the sympathetic cooling laser, thus unambiguously show the necessity of sympathetic cooling for the long-time storage of multiple ionic qubits.

References in corpus (31)

• Long-distance quantum communication with atomic ensembles and linear optics
• Surface codes: Towards practical large-scale quantum computation
• Superconducting Qubits: Current State of Play
• Experimental issues in coherent quantum-state manipulation of trapped atomic ions
• Trapped-Ion Quantum Computing: Progress and Challenges
• A Theory of Fault-Tolerant Quantum Computation
• Roads towards fault-tolerant universal quantum computation
• A 10-qubit solid-state spin register with quantum memory up to one minute
• Superconducting Quantum Computing: A Review
• Single ion-qubit exceeding one hour coherence time
• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Demonstration of fault-tolerant universal quantum gate operations
• High-rate, high-fidelity entanglement of qubits across an elementary quantum network
• Single-qubit quantum memory exceeding $10$-minute coherence time
• Telecom-heralded entanglement between remote multimode solid-state quantum memories
• Efficient quantum memory for single photon polarization qubits
• Tunable ion-photon entanglement in an optical cavity
• Arbitrarily accurate composite pulses
• An efficient quantum light-matter interface with sub-second lifetime
• High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion
• Sympathetic cooling of ${}^{9}B{e}^{+}$ and ${}^{24}M{g}^{+}$ for quantum logic
• Cryogenic Trapped-Ion System for Large Scale Quantum Simulation
• Light-matter entanglement over 50 km of optical fibre
• Assembly and coherent control of a register of nuclear spin qubits
• Storage of photonic time-bin qubits for up to 20 ms in a rare-earth doped crystal
• Sympathetic ground state cooling and time-dilation shifts in an ${}^{27}{\text{Al}}^{+}$ optical clock
• Sympathetic Cooling of Trapped Cd+ Isotopes
• Realizing coherently convertible dual-type qubits with the same ion species
• Experimental realization of 105-qubit random access quantum memory
• Concatenated composite pulses compensating simultaneous systematic errors
• Memory coherence of a sympathetically cooled trapped-ion qubit

Cited by in corpus (4)

• Quantum Computing Universal Thermalization Dynamics in a (2+1)D Lattice Gauge Theory
• Quasi-Perfect State Transfer in Spin Chains via Parametrization of On-Site Energies
• Floquet control of interactions and edge states in a programmable quantum simulator
• State transfer analysis for linear spin chains with non-uniform on-site energies