2021
DOI: 10.48550/arxiv.2112.02568
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Swap-test interferometry with biased ancilla noise

Abstract: The Mach-Zehnder interferometer is a powerful device for detecting small phase shifts between two light beams. Simple input states-such as coherent states or single photons-can reach the standard quantum limit of phase estimation while more complicated states can be used to reach Heisenberg scaling; the latter, however, require complex states at the input of the interferometer which are difficult to prepare. The quest for highly sensitive phase estimation therefore calls for interferometers with nonlinear devi… Show more

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Cited by 3 publications
(2 citation statements)
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“…The error-transparency of the present gate construction to the dominant error source of the Kerr-cat ancilla enables the realization of an (almost) nondestructive measurement of the SWAP operator or equivalently, the exchange symmetry between multi-qubit or photonic systems. This is because the dominant phase-flip error in the ancilla which applies the conditional-SWAP, can only cause a misidentification of the exchange symmetry of the states, and cannot change or destroy the states being swapped [68]. This is unlike the case of a controlled-SWAP operation with an ancilla suffering from bit-flip errors since this type of error results in destructive back action on the bosonic states.…”
Section: Introductionmentioning
confidence: 99%
“…The error-transparency of the present gate construction to the dominant error source of the Kerr-cat ancilla enables the realization of an (almost) nondestructive measurement of the SWAP operator or equivalently, the exchange symmetry between multi-qubit or photonic systems. This is because the dominant phase-flip error in the ancilla which applies the conditional-SWAP, can only cause a misidentification of the exchange symmetry of the states, and cannot change or destroy the states being swapped [68]. This is unlike the case of a controlled-SWAP operation with an ancilla suffering from bit-flip errors since this type of error results in destructive back action on the bosonic states.…”
Section: Introductionmentioning
confidence: 99%
“…The error-transparency of the present gate construction to the dominant error source of the Kerr-cat ancilla enables the realization of an (almost) nondestructive measurement of the SWAP operator or equivalently, the exchange symmetry between multi-qubit or photonic systems. This is because the dominant phase-flip error in the ancilla which applies the conditional-SWAP, can only cause a misidentification of the exchange symmetry of the states, and cannot change or destroy the states being swapped [62]. This is unlike the case of a controlled-SWAP operation with an ancilla suffering from bit-flip errors since this type of error results in destructive back action on the bosonic states.…”
Section: Introductionmentioning
confidence: 99%