Quantum Sensing with Erasure Qubits

Area of Science:

• Quantum Information Science
• Quantum Metrology
• Quantum Sensing

Background:

• Erasure qubits are a type of quantum bit where errors are detectable and locatable.
• Current research on erasure qubits predominantly targets quantum computing and networking.
• Fault tolerance in quantum systems often requires significant overhead.

Purpose of the Study:

• To investigate the potential of erasure qubits in quantum sensing and metrology.
• To theoretically and experimentally compare the precision of erasure qubits against non-erasure qubits under similar noise conditions.

Main Methods:

• Theoretical analysis of erasure qubit performance in sensing and metrology.
• Experimental demonstration using a differential optical lattice clock.
• Artificial injection of erasure errors (atom loss) and dephasing errors to compare noise impacts.

Main Results:

• Theoretical prediction: Erasure qubits offer higher precision than non-erasure qubits for equivalent noise levels.
• Experimental validation: Erasure errors led to enhanced precision in clock comparisons compared to dephasing errors at the same error rate.
• Quantified improvement: Erasure errors improved clock stability by a factor of two in repeated measurement cycles.

Conclusions:

• Erasure qubits present a viable and advantageous approach for enhancing precision in quantum sensing and metrology.
• The benefits of erasure qubits extend to various quantum platforms, including Rydberg atoms and superconducting qubits.
• Reducing overhead for fault tolerance is a key advantage of erasure qubits, applicable beyond computing and networking.