Counter-factual carving exponentially improves entangled-state fidelity
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866909094722404352 |
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| author | Ramette, Joshua Sinclair, Josiah Vuletić, Vladan |
| author_facet | Ramette, Joshua Sinclair, Josiah Vuletić, Vladan |
| contents | We propose a new method, "counter-factual" carving, that uses the "no-jump" evolution of a probe to generate entangled many-body states of high fidelity. The probe is coupled to a target ensemble of qubits and engineered to exponentially decay at a rate depending on the target collective spin, such that post-selecting on observing no probe decay precisely removes select faster-decaying spin components. When probe and $N$-qubit target interact via a cavity mode of cooperativity $C$, counter-factual carving generates entangled states with infidelities of $e^{-C/N}$, an exponential improvement over previous carving schemes. Counter-factual carving can generate complex entangled states for applications in quantum metrology and quantum computing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_11407 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Counter-factual carving exponentially improves entangled-state fidelity Ramette, Joshua Sinclair, Josiah Vuletić, Vladan Quantum Physics Atomic Physics We propose a new method, "counter-factual" carving, that uses the "no-jump" evolution of a probe to generate entangled many-body states of high fidelity. The probe is coupled to a target ensemble of qubits and engineered to exponentially decay at a rate depending on the target collective spin, such that post-selecting on observing no probe decay precisely removes select faster-decaying spin components. When probe and $N$-qubit target interact via a cavity mode of cooperativity $C$, counter-factual carving generates entangled states with infidelities of $e^{-C/N}$, an exponential improvement over previous carving schemes. Counter-factual carving can generate complex entangled states for applications in quantum metrology and quantum computing. |
| title | Counter-factual carving exponentially improves entangled-state fidelity |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2401.11407 |