Experimental quantum information processing with 43Ca+ ions

Abstract

For quantum information processing (QIP) with trapped ions, the isotope 43Ca+ offers the combined advantages of a quantum memory with long coherence time, a high fidelity read out and the possibility of performing two qubit gates on a quadrupole transition with a narrow-band laser. Compared to other ions used for quantum computing, 43Ca+ has a relatively complicated level structure. In this paper we discuss how to meet the basic requirements for QIP and demonstrate ground state cooling, robust state initialization and efficient read out for the hyperfine qubit with a single 43Ca+ ion. A microwave field and a Raman light field are used to drive qubit transitions, and the coherence times for both fields are compared. Phase errors due to interferometric instabilities in the Raman field generation do not limit the experiments on a time scale of 100 ms. We find a quantum information storage time of many seconds for the hyperfine qubit.

9 pages, 10 figures

References in corpus (10)

• Scalable multi-particle entanglement of trapped ions
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• Quantum state engineering on an optical transition and decoherence in a Paul trap
• Ion-trap quantum logic using long-wavelength radiation
• Implementation of Grover's Quantum Search Algorithm in a Scalable System
• Isotope-selective photo-ionization for calcium ion trapping
• How to realize a universal quantum gate with trapped ions
• Entanglement of Trapped-Ion Clock States
• Measurement of the hyperfine structure of the S1/2-D5/2 transition in 43Ca+
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• Coherent Manipulation of a Ca Spin Qubit in a Micro Ion Trap
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• High-fidelity spatial and polarization addressing of Ca-43 qubits using near-field microwave control
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• High fidelity entanglement of 43Ca+ hyperfine clock states
• Quantum control of ${}^{88}$Sr${}^{+}$ in a miniature linear Paul trap
• Revealing missing charges with generalised quantum fluctuation relations
• Shuttling of Rydberg ions for fast entangling operations
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• Quantum Logic Between Distant Trapped Ions
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• Dark-resonance Doppler cooling and high fluorescence in trapped Ca-43 ions at intermediate magnetic field
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• A single trapped ion in a finite range trap
• Injection-locking of violet laser diodes with a 3.2GHz offset frequency for driving Raman transitions in 43Ca+
• Quantum communication between trapped ions through a dissipative environment
• Fluctuations of work in realistic equilibrium states of quantum systems with conserved quantities
• Simplified approach to generate controlled-NOT gates with single trapped ions for arbitrary Lamb-Dicke parameters
• Disorder-Free Localization and Fragmentation in a Non-Abelian Lattice Gauge Theory
• Ion-Based Characterization of Laser Beam Profiles for Quantum Information Processing
• Doubly-ionized lanthanum as a qubit candidate for quantum networks