Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.110502
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Funding
- Lundbeck Foundation
- NSF
- CUA
- DARPA
- AFOSR MURI
- ARL
- European Research Council under the European Union's Seventh Framework Programme (FP) through SIQS [600645]
- ERC Grant QIOS [306576]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1521560, 1205635] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205923, 0969816, 1125846] Funding Source: National Science Foundation
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We propose and analyze heralded quantum gates between qubits in optical cavities. They employ an auxiliary qubit to report if a successful gate occurred. In this manner, the errors, which would have corrupted a deterministic gate, are converted into a nonunity probability of success: once successful, the gate has a much higher fidelity than a similar deterministic gate. Specifically, we describe that a heralded, near-deterministic controlled phase gate (CZ gate) with the conditional error arbitrarily close to zero and the success probability that approaches unity as the cooperativity of the system, C, becomes large. Furthermore, we describe an extension to near-deterministic N-qubit Toffoli gate with a favorable error scaling. These gates can be directly employed in quantum repeater networks to facilitate near-ideal entanglement swapping, thus greatly speeding up the entanglement distribution.
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