A Ramsey-type array of N unentangled qubits can detect wave-like dark matter with coupling sensitivity δα ∼ 1/(T√N), rivaling entangled-qubit schemes.
High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
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abstract
We implement all single-qubit operations with fidelities significantly above the minimum threshold required for fault-tolerant quantum computing, using a trapped-ion qubit stored in hyperfine "atomic clock" states of $^{43}$Ca$^+$. We measure a combined qubit state preparation and single-shot readout fidelity of 99.93%, a memory coherence time of $T^*_2=50$ seconds, and an average single-qubit gate fidelity of 99.9999%. These results are achieved in a room-temperature microfabricated surface trap, without the use of magnetic field shielding or dynamic decoupling techniques to overcome technical noise.
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CONDITIONAL 2representative citing papers
An error-resilient gate search scheme using multi-objective optimization and pulse symmetries enables microsecond two-qubit gates with fidelities approaching 99.9% in linear ion traps of up to 50 ions.
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Coherent collective response in many-qubit systems for dark matter detection
A Ramsey-type array of N unentangled qubits can detect wave-like dark matter with coupling sensitivity δα ∼ 1/(T√N), rivaling entangled-qubit schemes.
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Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors
An error-resilient gate search scheme using multi-objective optimization and pulse symmetries enables microsecond two-qubit gates with fidelities approaching 99.9% in linear ion traps of up to 50 ions.