Quantum-Enhanced Change Detection and Joint Communication-Detection

• URL: http://arxiv.org/abs/2504.17237v1
• Date: Thu, 24 Apr 2025 04:17:55 GMT
• Title: Quantum-Enhanced Change Detection and Joint Communication-Detection
• Authors: Zihao Gong, Saikat Guha,
• Abstract summary: We demonstrate that pre-shared entanglement using two-mode squeezed vacuum states significantly reduces detection latency.<n>The change detection latency is inversely proportional to the quantum relative entropy (QRE), which goes to infinity in the absence of thermal noise.
• Score: 1.1567011102709834
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quick detection of transmittance changes in optical channel is crucial for secure communication. We demonstrate that pre-shared entanglement using two-mode squeezed vacuum states significantly reduces detection latency compared to classical and entanglement-augmented coherent-state probes. The change detection latency is inversely proportional to the quantum relative entropy (QRE), which goes to infinity in the absence of thermal noise, suggesting idealized instantaneous detection. However, in realistic scenarios, we show that QRE scales logarithmically with the inverse of the thermal noise mean photon number. We propose a receiver that achieves this scaling and quantify its performance gains over existing methods. Additionally, we explore the fundamental trade-off between communication capacity and change detection latency, highlighting how pre-shared entanglement enhances both.

Related papers

• Selective Filtering of Photonic Quantum Entanglement via Anti-Parity-Time Symmetry [32.09520868775991]
  Entanglement is a key resource for quantum computing, sensing, and communication. We introduce a new approach to entanglement retrieval exploiting non-Hermitian systems. Our work offers new insights into using non-Hermitian symmetries to address central challenges in quantum technologies.
  arXiv  Detail & Related papers  (2025-04-08T00:31:07Z)
• Quantum-enhanced quickest change detection of transmission loss [0.9633494094538018]
  A sudden increase of loss in an optical communications channel can be caused by a malicious wiretapper, or for a benign reason such as inclement weather in a free-space channel or an unintentional bend in an optical fiber.<n>We show that adding a small amount of squeezing to bright phase-modulated coherent-state pulses can dramatically increase the homodyne detection receiver's sensitivity to change detection in channel loss, without affecting the communications rate.
  arXiv  Detail & Related papers  (2025-03-15T22:18:43Z)
• Acoustic phonon phase gates with number-resolving phonon detection [36.29277627484587]
  Itinerant phonons in quantum acoustics, combined with superconducting qubits, offer a compelling alternative to the quantum optics approach. We implement phonon phase control using the frequency-dependent scattering of phonon states from a superconducting transmon qubit. The acoustic interferometer used to measure the resulting phonon phase achieves a noise-floor-limited Hong-Ou-Mandel interference visibility of 98.1%.
  arXiv  Detail & Related papers  (2025-03-05T20:56:35Z)
• Enhancement of sensitivity near exceptional points in dissipative qubit-resonator systems [10.877863413220087]
  We propose and demonstrate a protocol for realizing non-Hermitian quantum sensors for probing the coupling between a qubit and a resonator subjecting to energy dissipations. The excitation-number conversion associated with the no-jump evolution trajectory enables removal of the noisy outcomes with quantum jumps. The sensitivity enhancement near the exceptional point is confirmed by both theoretical calculation and experimental measurement.
  arXiv  Detail & Related papers  (2025-01-27T04:36:57Z)
• Boundary Time Crystals as AC sensors: enhancements and constraints [39.58317527488534]
  We find an enhanced sensitivity of the BTC when its spins are resonant with the applied AC field.<n>Despite its long coherence time and multipartite correlations, the entropic cost of the BTC hinders an optimal decoding of the AC field information.
  arXiv  Detail & Related papers  (2024-06-10T13:53:31Z)
• Mitigating Errors on Superconducting Quantum Processors through Fuzzy Clustering [38.02852247910155]
  A new Quantum Error Mitigation (QEM) technique uses Fuzzy C-Means clustering to specifically identify measurement error patterns. We report a proof-of-principle validation of the technique on a 2-qubit register, obtained as a subset of a real NISQ 5-qubit superconducting quantum processor. We demonstrate that the FCM-based QEM technique allows for reasonable improvement of the expectation values of single- and two-qubit gates based quantum circuits.
  arXiv  Detail & Related papers  (2024-02-02T14:02:45Z)
• Detecting changes to sub-diffraction objects with quantum-optimal speed and accuracy [0.8409980020848168]
  We evaluate the best possible average latency, for a fixed false alarm rate, for sub-diffraction incoherent imaging. We find that direct focal-plane detection of the incident optical intensity achieves sub-optimal detection latencies. We verify these results via Monte Carlo simulation of the change detection procedure and quantify a growing gap between the conventional and quantum-optimal receivers.
  arXiv  Detail & Related papers  (2023-08-14T16:48:18Z)
• Harnessing high-dimensional temporal entanglement using limited interferometric setups [41.94295877935867]
  We develop the first complete analysis of high-dimensional entanglement in the polarization-time-domain. We show how to efficiently certify relevant density matrix elements and security parameters for Quantum Key Distribution. We propose a novel setup that can further enhance the noise resistance of free-space quantum communication.
  arXiv  Detail & Related papers  (2023-08-08T17:44:43Z)
• Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory [47.00474212574662]
  A superconducting qubit is coupled to a large-bandwidth readout resonator. We show a beyond-state-of-the-art two-state-readout error of only 0.25,%$ in 100 ns integration time. The presented results are expected to further boost the performance of new and existing algorithms and protocols.
  arXiv  Detail & Related papers  (2023-07-15T10:30:10Z)
• Ultimate limits for quickest quantum change-point detection [3.376269351435396]
  We discuss quickest change point detection in quantum channels. We give a lower-bound on the mean minimum delay when the expected time of a false alarm is bounded. In addition, we give particular strategies based on repeated measurements on independent blocks of samples.
  arXiv  Detail & Related papers  (2022-08-05T16:35:52Z)
• Homodyne Detection Quadrature Phase Shift Keying Continuous-Variable Quantum Key Distribution with High Excess Noise Tolerance [7.87972015113057]
  We propose a homodyne detection protocol using the quadrature phase shift keying technique. By limiting information leakage, our proposed protocol enhances excess noise tolerance to a high level. Our results imply that the current protocol is able to distribute keys in nearly intercity area.
  arXiv  Detail & Related papers  (2021-04-22T16:10:35Z)
• Rapid and Unconditional Parametric Reset Protocol for Tunable Superconducting Qubits [12.429990467686526]
  We report a fast and high-fidelity reset scheme for qubits in quantum computing. By modulating the flux through a transmon qubit, we realize a swap between the qubit and its readout resonator. Our approach can achieve effective second excited state depletion, (ii) has negligible effects on neighbouring qubits, and (iii) offers a way to entangle the qubit with an itinerant single photon.
  arXiv  Detail & Related papers  (2021-03-21T06:22:59Z)

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.