Degeneracy-preserving quantum non-demolition measurement of parity-type observables for cat-qubits
| Autor: | W. Clarke Smith, Mazyar Mirrahimi, Joachim Cohen, Michel Devoret |
|---|---|
| Přispěvatelé: | QUANTum Information Circuits (QUANTIC), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Inria de Paris, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Yale University [New Haven], Inria de Paris, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-MINES ParisTech - École nationale supérieure des mines de Paris |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Quantum nondemolition measurement
Physics Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics General Physics and Astronomy FOS: Physical sciences Parity (physics) Observable Quantum capacity 01 natural sciences 010305 fluids & plasmas [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] Quantum error correction Quantum mechanics Qubit 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Quantum information 010306 general physics Quantum Physics (quant-ph) Quantum |
| Zdroj: | Physical Review Letters Physical Review Letters, 2017, ⟨10.1103/PhysRevLett.119.060503⟩ Physical Review Letters, American Physical Society, 2017, ⟨10.1103/PhysRevLett.119.060503⟩ |
| ISSN: | 0031-9007 1079-7114 |
| Popis: | A central requirement for any quantum error correction scheme is the ability to perform quantum non-demolition measurements of an error syndrome, corresponding to a special symmetry property of the encoding scheme. It is in particular important that such a measurement does not introduce extra error mechanisms, not included in the error model of the correction scheme. In this letter, we ensure such a robustness by designing an interaction with a measurement device that preserves the degeneracy of the measured observable. More precisely, we propose a scheme to perform continuous and quantum non-demolition measurement of photon-number parity in a microwave cavity. This corresponds to the error syndrome in a class of error correcting codes called the cat-codes, which have recently proven to be efficient and versatile for quantum information processing. In our design, we exploit the strongly nonlinear Hamiltonian of a high-impedance Josephson circuit, coupling a high-Q cavity storage cavity mode to a low-Q readout one. By driving the readout resonator at its resonance, the phase of the reflected/transmitted signal carries directly exploitable information on parity-type observables for encoded cat-qubits of the high-Q mode. 25 pages, 7 figures |
| Databáze: | OpenAIRE |
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