Clock offset recovery with sublinear complexity enables synchronization on low-level hardware for quantum key distribution

• URL: http://arxiv.org/abs/2404.04081v2
• Date: Mon, 8 Apr 2024 11:06:47 GMT
• Title: Clock offset recovery with sublinear complexity enables synchronization on low-level hardware for quantum key distribution
• Authors: Jan Krause, Nino Walenta, Jonas Hilt, Ronald Freund,
• Abstract summary: We introduce iQSync, a clock offset recovery method for quantum key distribution (QKD) iQSync requires minimal memory, only a simple instruction set (e.g. no floating-point operations), and can be evaluated with sublinear time complexity. We implement the method on our QKD platform, demonstrating its performance and conformity with analytically derived success probabilities for channel attenuations exceeding 70 dB.
• Score: 0.19999259391104385
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce iQSync, a clock offset recovery method designed for implementation on low-level hardware, such as FPGAs or microcontrollers, for quantum key distribution (QKD). iQSync requires minimal memory, only a simple instruction set (e.g. no floating-point operations), and can be evaluated with sublinear time complexity, typically involving no more than a few thousand iterations of a simple loop. Furthermore, iQSync allows for a precise clock offset recovery within few seconds, even for large offsets, and is well suited for scenarios with high channel loss and low signal-to-noise ratio, irrespective of the prepare-and-measure QKD protocol used. We implemented the method on our QKD platform, demonstrating its performance and conformity with analytically derived success probabilities for channel attenuations exceeding 70 dB.

Related papers

• Fast unconditional reset and leakage reduction in fixed-frequency transmon qubits [5.648269866084686]
  We show a protocol capable of implementing both qubit reset and leakage reduction. In total, the combination of qubit reset, leakage reduction, and coupler reset takes only 83ns to complete. Our protocol also provides a means to both reduce QEC cycle runtime and improve algorithmic fidelity on quantum computers.
  arXiv  Detail & Related papers  (2024-09-25T08:57:41Z)
• Quantum Compiling with Reinforcement Learning on a Superconducting Processor [55.135709564322624]
  We develop a reinforcement learning-based quantum compiler for a superconducting processor. We demonstrate its capability of discovering novel and hardware-amenable circuits with short lengths. Our study exemplifies the codesign of the software with hardware for efficient quantum compilation.
  arXiv  Detail & Related papers  (2024-06-18T01:49:48Z)
• Compressed-sensing Lindbladian quantum tomography with trapped ions [44.99833362998488]
  Characterizing the dynamics of quantum systems is a central task for the development of quantum information processors. We propose two different improvements of Lindbladian quantum tomography (LQT) that alleviate previous shortcomings.
  arXiv  Detail & Related papers  (2024-03-12T09:58:37Z)
• Fault-tolerant quantum architectures based on erasure qubits [49.227671756557946]
  We exploit the idea of erasure qubits, relying on an efficient conversion of the dominant noise into erasures at known locations. We propose and optimize QEC schemes based on erasure qubits and the recently-introduced Floquet codes. Our results demonstrate that, despite being slightly more complex, QEC schemes based on erasure qubits can significantly outperform standard approaches.
  arXiv  Detail & Related papers  (2023-12-21T17:40:18Z)
• Real-time error mitigation for variational optimization on quantum hardware [45.935798913942904]
  We define a Real Time Quantum Error Mitigation (RTQEM) algorithm to assist in fitting functions on quantum chips with VQCs. Our RTQEM routine can enhance VQCs' trainability by reducing the corruption of the loss function.
  arXiv  Detail & Related papers  (2023-11-09T19:00:01Z)
• Qubit-based distributed frame synchronization for quantum key distribution [9.43392013925968]
  We propose a qubit-based distributed frame synchronization method that can achieve time recovery in a continuously running system. Experimental results show that the proposed method outperforms the advanced qubit-based synchronization method Qubit4Sync. We believe our method is applicable to a broad range of QKD scenarios, including drone-based QKD and quantum network construction.
  arXiv  Detail & Related papers  (2023-08-25T03:17:43Z)
• Asynchronous measurement-device-independent quantum key distribution with hybrid source [6.7097515257155225]
  We propose an AMDI-QKD protocol with a nonclassical light source. We show that our proposed hybrid source protocol significantly enhances the key rate of the AMDI-QKD protocol.
  arXiv  Detail & Related papers  (2023-04-10T13:18:48Z)
• Quantum Circuit Fidelity Improvement with Long Short-Term Memory Networks [1.2461503242570644]
  NISQ computers show great promise in accelerating many tasks that are not practically possible using classical computation. One important reason is due to the fragile nature of quantum hardware. As the building blocks of a quantum circuit (QC), quantum gates and qubits are susceptible to external interference.
  arXiv  Detail & Related papers  (2023-03-30T16:44:12Z)
• Resource-efficient quantum key distribution with integrated silicon photonics [9.319767987871627]
  Integrated photonics provides a promising platform for quantum key distribution (QKD) system in terms of miniaturization, robustness and scalability. Here, we report a demonstration of resource-efficient chip-based BB84 QKD with a silicon-based encoder and decoder.
  arXiv  Detail & Related papers  (2022-12-26T01:45:13Z)
• Data post-processing for the one-way heterodyne protocol under composable finite-size security [62.997667081978825]
  We study the performance of a practical continuous-variable (CV) quantum key distribution protocol. We focus on the Gaussian-modulated coherent-state protocol with heterodyne detection in a high signal-to-noise ratio regime. This allows us to study the performance for practical implementations of the protocol and optimize the parameters connected to the steps above.
  arXiv  Detail & Related papers  (2022-05-20T12:37:09Z)
• Composably secure data processing for Gaussian-modulated continuous variable quantum key distribution [58.720142291102135]
  Continuous-variable quantum key distribution (QKD) employs the quadratures of a bosonic mode to establish a secret key between two remote parties. We consider a protocol with homodyne detection in the general setting of composable finite-size security. In particular, we analyze the high signal-to-noise regime which requires the use of high-rate (non-binary) low-density parity check codes.
  arXiv  Detail & Related papers  (2021-03-30T18:02:55Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.