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Measurement-based quantum control of mechanical motion. Nature 2018; 563:53-58. [DOI: 10.1038/s41586-018-0643-8] [Citation(s) in RCA: 187] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 09/13/2018] [Indexed: 11/08/2022]
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Roch N, Schwartz ME, Motzoi F, Macklin C, Vijay R, Eddins AW, Korotkov AN, Whaley KB, Sarovar M, Siddiqi I. Observation of measurement-induced entanglement and quantum trajectories of remote superconducting qubits. PHYSICAL REVIEW LETTERS 2014; 112:170501. [PMID: 24836225 DOI: 10.1103/physrevlett.112.170501] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Indexed: 05/23/2023]
Abstract
The creation of a quantum network requires the distribution of coherent information across macroscopic distances. We demonstrate the entanglement of two superconducting qubits, separated by more than a meter of coaxial cable, by designing a joint measurement that probabilistically projects onto an entangled state. By using a continuous measurement scheme, we are further able to observe single quantum trajectories of the joint two-qubit state, confirming the validity of the quantum Bayesian formalism for a cascaded system. Our results allow us to resolve the dynamics of continuous projection onto the entangled manifold, in quantitative agreement with theory.
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Affiliation(s)
- N Roch
- Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA
| | - M E Schwartz
- Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA
| | - F Motzoi
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - C Macklin
- Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA
| | - R Vijay
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India
| | - A W Eddins
- Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA
| | - A N Korotkov
- Department of Electrical Engineering, University of California, Riverside, California 92521, USA
| | - K B Whaley
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - M Sarovar
- Scalable and Secure Systems Research (08961), Sandia National Laboratories, Livermore, California 94550, USA
| | - I Siddiqi
- Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA
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Palomaki TA, Teufel JD, Simmonds RW, Lehnert KW. Entangling Mechanical Motion with Microwave Fields. Science 2013; 342:710-3. [DOI: 10.1126/science.1244563] [Citation(s) in RCA: 447] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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