Numerically optimized quantum error-correcting codes for a bosonic mode

Markus Grassl

Marios H. Michael, Matti Silveri, Richard Brierley +4 more

Optimal quantum error-correction codes are necessary to extend the lifetime of quantum memories. A new error-correction code to rectify photon loss, gain, and dephasing errors in electromagnetic cavities is presented.

Jing Wu, Quntao Zhuang

Quantum error correction is essential for robust quantum-information processing with noisy devices. As bosonic quantum systems play a role in quantum sensing, communication, and computation, it is useful to design error-correction codes suitable for these systems against various different types of noises. While most efforts aim at protecting qubits encoded into the infinite-dimensional Hilbert space of a bosonic mode, Ref. [Phys. Rev. Lett. 125, 080503 (2020)] proposed an error-correction code to maintain the infinite-dimensional-Hilbert-space nature of bosonic systems by encoding a single bosonic mode into multiple bosonic modes. Enabled by Gottesman-Kitaev-Preskill states as ancilla, the code overcomes the no-go theorem of Gaussian error correction. In this work, we generalize the error-correction code to the scenario with general correlated and heterogeneous Gaussian noises, including memory effects. We introduce Gaussian preprocessing and postprocessing to convert the general noise model to an independent but heterogeneous collection of additive white Gaussian noise channels and then apply concatenated codes in an optimized manner. To evaluate the performance, we develop a theory framework to enable the efficient calculation of the noise SD after the error correction, despite the non-Gaussian nature of the codes. Our code provides the optimal scaling of the residue-noise SD with the number of modes and can be widely applied to distributed sensor networks, network communication, and composite quantum-memory systems.

Luyan Sun, Ling Hu, Yuwei Ma +10 more

K.N.P. Kumar

Feedback Based On Multi-Qubit Measurements, Multiple-Particle Interference And Quantum Error Correction, Theory Of Quantum Error-Correcting Codes, Theory Of Quantum Error-Correcting Codes-2, Theory Of Quantum Error-Correcting Codes-3, New Class Of Quantum Error-Correcting Codes For A Bosonic Mode, New Class Of Quantum Error-Correcting Codes For A Bosonic Mode, Bosonic Quantum Memories, Photonic Quantum Communication, And Optical-To-Microwave Up- And Down-Conversion, Mixed State Entanglement And Quantum Error Correction, Mixed State Entanglement And Quantum Error Correction-2, Mixed State Entanglement And Quantum Error Correction-3, Universal Operator Theoretic Framework For Quantum Fault Tolerance, Efficiently Controllable Graphs. Foregoing system and its connected properties are studied in detail. The full paper: http://www.iiste.org/PDFshare/APTA-PAGENO-555138-561343.pdf

Pavel Bažant