Quantum Trajectories and Their Statistics for Remotely Entangled Quantum Bits
We experimentally and theoretically investigate the quantum trajectories of jointly monitored transmon qubits embedded in spatially separated microwave cavities. Using nearly quantum-noise-limited superconducting amplifiers and an optimized setup to reduce signal loss between cavities, we can effici...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2016-12-01
|
| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.6.041052 |
| _version_ | 1818896680709259264 |
|---|---|
| author | Areeya Chantasri Mollie E. Kimchi-Schwartz Nicolas Roch Irfan Siddiqi Andrew N. Jordan |
| author_facet | Areeya Chantasri Mollie E. Kimchi-Schwartz Nicolas Roch Irfan Siddiqi Andrew N. Jordan |
| author_sort | Areeya Chantasri |
| collection | DOAJ |
| description | We experimentally and theoretically investigate the quantum trajectories of jointly monitored transmon qubits embedded in spatially separated microwave cavities. Using nearly quantum-noise-limited superconducting amplifiers and an optimized setup to reduce signal loss between cavities, we can efficiently track measurement-induced entanglement generation as a continuous process for single realizations of the experiment. The quantum trajectories of transmon qubits naturally split into low and high entanglement classes. The distribution of concurrence is found at any given time, and we explore the dynamics of entanglement creation in the state space. The distribution exhibits a sharp cutoff in the high concurrence limit, defining a maximal concurrence boundary. The most-likely paths of the qubits’ trajectories are also investigated, resulting in three probable paths, gradually projecting the system to two even subspaces and an odd subspace, conforming to a “half-parity” measurement. We also investigate the most-likely time for the individual trajectories to reach their most entangled state, and we find that there are two solutions for the local maximum, corresponding to the low and high entanglement routes. The theoretical predictions show excellent agreement with the experimental entangled-qubit trajectory data. |
| first_indexed | 2024-12-19T19:04:08Z |
| format | Article |
| id | doaj.art-6a450193dc704d2a8382cc56265212b7 |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-12-19T19:04:08Z |
| publishDate | 2016-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-6a450193dc704d2a8382cc56265212b72022-12-21T20:09:29ZengAmerican Physical SocietyPhysical Review X2160-33082016-12-016404105210.1103/PhysRevX.6.041052Quantum Trajectories and Their Statistics for Remotely Entangled Quantum BitsAreeya ChantasriMollie E. Kimchi-SchwartzNicolas RochIrfan SiddiqiAndrew N. JordanWe experimentally and theoretically investigate the quantum trajectories of jointly monitored transmon qubits embedded in spatially separated microwave cavities. Using nearly quantum-noise-limited superconducting amplifiers and an optimized setup to reduce signal loss between cavities, we can efficiently track measurement-induced entanglement generation as a continuous process for single realizations of the experiment. The quantum trajectories of transmon qubits naturally split into low and high entanglement classes. The distribution of concurrence is found at any given time, and we explore the dynamics of entanglement creation in the state space. The distribution exhibits a sharp cutoff in the high concurrence limit, defining a maximal concurrence boundary. The most-likely paths of the qubits’ trajectories are also investigated, resulting in three probable paths, gradually projecting the system to two even subspaces and an odd subspace, conforming to a “half-parity” measurement. We also investigate the most-likely time for the individual trajectories to reach their most entangled state, and we find that there are two solutions for the local maximum, corresponding to the low and high entanglement routes. The theoretical predictions show excellent agreement with the experimental entangled-qubit trajectory data.http://doi.org/10.1103/PhysRevX.6.041052 |
| spellingShingle | Areeya Chantasri Mollie E. Kimchi-Schwartz Nicolas Roch Irfan Siddiqi Andrew N. Jordan Quantum Trajectories and Their Statistics for Remotely Entangled Quantum Bits Physical Review X |
| title | Quantum Trajectories and Their Statistics for Remotely Entangled Quantum Bits |
| title_full | Quantum Trajectories and Their Statistics for Remotely Entangled Quantum Bits |
| title_fullStr | Quantum Trajectories and Their Statistics for Remotely Entangled Quantum Bits |
| title_full_unstemmed | Quantum Trajectories and Their Statistics for Remotely Entangled Quantum Bits |
| title_short | Quantum Trajectories and Their Statistics for Remotely Entangled Quantum Bits |
| title_sort | quantum trajectories and their statistics for remotely entangled quantum bits |
| url | http://doi.org/10.1103/PhysRevX.6.041052 |
| work_keys_str_mv | AT areeyachantasri quantumtrajectoriesandtheirstatisticsforremotelyentangledquantumbits AT mollieekimchischwartz quantumtrajectoriesandtheirstatisticsforremotelyentangledquantumbits AT nicolasroch quantumtrajectoriesandtheirstatisticsforremotelyentangledquantumbits AT irfansiddiqi quantumtrajectoriesandtheirstatisticsforremotelyentangledquantumbits AT andrewnjordan quantumtrajectoriesandtheirstatisticsforremotelyentangledquantumbits |