{"paper":{"title":"Loss-induced quantum nonreciprocity and entanglement in superconducting qubits","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Loss in auxiliary cavities can induce nonreciprocal coupling and entanglement between two remote superconducting qubits through direction-dependent interference.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Peng-Bo Li, Yu-Meng Ren","submitted_at":"2026-05-12T03:14:35Z","abstract_excerpt":"Losses are ubiquitous in physics and are usually regarded as harmful in quantum information processing. Here, we propose a loss-induced scheme to achieve nonreciprocity and nonreciprocal entanglement in a superconducting platform, where two remote superconducting transmon qubits are connected via two lossy auxiliary cavities. The nonreciprocity in our scheme originates from interference between multiple lossy coupling paths. The coherent phases associated with the qubit-resonator couplings reverse sign under propagation reversal, while the loss-induced phases remain direction independent. Thei"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We show that this loss-induced scheme can generate nonreciprocal quantum entanglement, indicating that loss can be utilized as a resource. Moreover, the tunability of nonreciprocity and nonreciprocal entanglement in our scheme can be manipulated by the relative phase induced by loss.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The coherent phases associated with the qubit-resonator couplings reverse sign under propagation reversal, while the loss-induced phases remain direction independent. Their combined effect leads to different interference conditions in the opposite directions.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Loss-induced phases in auxiliary cavities create asymmetric interference, yielding tunable nonreciprocal couplings and entanglement between remote transmon qubits.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Loss in auxiliary cavities can induce nonreciprocal coupling and entanglement between two remote superconducting qubits through direction-dependent interference.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"d6ece69b6bd1bb6a21ebb341ebadc636ae6d071e7895b73cde70d26d7027482e"},"source":{"id":"2605.11457","kind":"arxiv","version":1},"verdict":{"id":"98409edf-7c56-46b5-b24d-826ddb3a8274","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-13T02:17:54.577253Z","strongest_claim":"We show that this loss-induced scheme can generate nonreciprocal quantum entanglement, indicating that loss can be utilized as a resource. Moreover, the tunability of nonreciprocity and nonreciprocal entanglement in our scheme can be manipulated by the relative phase induced by loss.","one_line_summary":"Loss-induced phases in auxiliary cavities create asymmetric interference, yielding tunable nonreciprocal couplings and entanglement between remote transmon qubits.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The coherent phases associated with the qubit-resonator couplings reverse sign under propagation reversal, while the loss-induced phases remain direction independent. Their combined effect leads to different interference conditions in the opposite directions.","pith_extraction_headline":"Loss in auxiliary cavities can induce nonreciprocal coupling and entanglement between two remote superconducting qubits through direction-dependent interference."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.11457/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"claim_evidence","ran_at":"2026-05-20T04:22:00.366060Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T12:35:52.828568Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_title_agreement","ran_at":"2026-05-19T10:01:16.409780Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T08:27:21.051870Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"8a8808af87b6cecc5593969ea1d9c451e2e82dde2e4d6ea9b080ffb872dfd02a"},"references":{"count":153,"sample":[{"doi":"","year":null,"title":"The con- necting modes are described by: ˆHc = P2 n=1 ω(n) c ˆc(n)†ˆc(n) withω (n) c the frequencies of the connecting modes","work_id":"901886d4-5789-4044-bf78-753a6802e686","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"i (A5) whereδω(t) =ω m(t)−ω 0 =A 1 cos(ωd1t+ψ 1) + A2 cos(ωd2t+ψ 2)and∆ (n) 0 =ω 0 −ω (n) c is the bare de- tuning of then-th connecting mode from the rotating frame frequencyω 0","work_id":"aa541d20-32f2-4043-9764-7e5aecc6d247","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"The trans- formation is given by the unitary operator ˆUm(t) = Texp h −i R t 0 δω(τ)dτ i","work_id":"db1e5890-2dc6-4da2-ac97-23d7fe1becc8","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"Interaction picture with respect to the bare detuning Then we introduce an interaction picture associate with the bare connecting mode detuning: ˆU∆0(t) = exp \" i 2X n=1 ∆(n) 0 ˆc(n)†ˆc(n)t # .(A8) An","work_id":"28393288-3a1b-491f-9306-3f52ec581f5f","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"∞X k=−∞ Jk A1 ωd1 eik(ωd1t+ψ1) # ·","work_id":"b4d72da5-0d98-4481-8cd1-0e3f8965a47f","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":153,"snapshot_sha256":"5a47922e4f387b51096f4591a3b64c903525a1470107a50d4e31ac06a2467d09","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}