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Ren ZQ, Lu XL, Xiang ZL. Heisenberg-limited spin squeezing in a hybrid system with silicon-vacancy centers. OPTICS EXPRESS 2024; 32:4013-4026. [PMID: 38297610 DOI: 10.1364/oe.499299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 01/08/2024] [Indexed: 02/02/2024]
Abstract
In this paper, we investigate the spin squeezing in a hybrid quantum system consisting of a Silicon-Vacancy (SiV) center ensemble coupled to a diamond acoustic waveguide via the strain interaction. Two sets of non-overlapping driving fields, each contains two time-dependent microwave fields, are applied to this hybrid system. By modulating these fields, the one-axis twist (OAT) interaction and two-axis two-spin (TATS) interaction can be independently realized. In the latter case the squeezing parameter scales to spin number as ξ R2∼1.61N -0.64 with the consideration of dissipation, which is very close to the Heisenberg limit. Furthermore, this hybrid system allows for the study of spin squeezing generated by the simultaneous presence of OAT and TATS interactions, which reveals sensitivity to the parity of the number of spins Ntot, whether it is even or odd. Our scheme enriches the approach for generating Heisenberg-limited spin squeezing in spin-phonon hybrid systems and offers the possibility for future applications in quantum information processing.
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Hernández Yanes T, Płodzień M, Mackoit Sinkevičienė M, Žlabys G, Juzeliūnas G, Witkowska E. One- and Two-Axis Squeezing via Laser Coupling in an Atomic Fermi-Hubbard Model. PHYSICAL REVIEW LETTERS 2022; 129:090403. [PMID: 36083675 DOI: 10.1103/physrevlett.129.090403] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 07/05/2022] [Accepted: 07/28/2022] [Indexed: 06/15/2023]
Abstract
Generation, storage, and utilization of correlated many-body quantum states are crucial objectives of future quantum technologies and metrology. Such states can be generated by the spin-squeezing protocols, i.e., one-axis twisting and two-axis countertwisting. In this Letter, we show activation of these two squeezing mechanisms in a system composed of ultracold atomic fermions in the Mott insulating phase by a position-dependent laser coupling of atomic internal states. Realization of both the squeezing protocols is feasible in the current state-of-the-art experiments.
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Affiliation(s)
- T Hernández Yanes
- Institute of Physics PAS, Aleja Lotnikow 32/46, 02-668 Warszawa, Poland
| | - M Płodzień
- ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Av. Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain
| | - M Mackoit Sinkevičienė
- Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio 3, LT-10257, Vilnius, Lithuania
| | - G Žlabys
- Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio 3, LT-10257, Vilnius, Lithuania
| | - G Juzeliūnas
- Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio 3, LT-10257, Vilnius, Lithuania
| | - E Witkowska
- Institute of Physics PAS, Aleja Lotnikow 32/46, 02-668 Warszawa, Poland
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Marciniak CD, Feldker T, Pogorelov I, Kaubruegger R, Vasilyev DV, van Bijnen R, Schindler P, Zoller P, Blatt R, Monz T. Optimal metrology with programmable quantum sensors. Nature 2022; 603:604-609. [PMID: 35322252 DOI: 10.1038/s41586-022-04435-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 01/18/2022] [Indexed: 11/09/2022]
Abstract
Quantum sensors are an established technology that has created new opportunities for precision sensing across the breadth of science. Using entanglement for quantum enhancement will allow us to construct the next generation of sensors that can approach the fundamental limits of precision allowed by quantum physics. However, determining how state-of-the-art sensing platforms may be used to converge to these ultimate limits is an outstanding challenge. Here we merge concepts from the field of quantum information processing with metrology, and successfully implement experimentally a programmable quantum sensor operating close to the fundamental limits imposed by the laws of quantum mechanics. We achieve this by using low-depth, parametrized quantum circuits implementing optimal input states and measurement operators for a sensing task on a trapped-ion experiment. With 26 ions, we approach the fundamental sensing limit up to a factor of 1.45 ± 0.01, outperforming conventional spin-squeezing with a factor of 1.87 ± 0.03. Our approach reduces the number of averages to reach a given Allan deviation by a factor of 1.59 ± 0.06 compared with traditional methods not using entanglement-enabled protocols. We further perform on-device quantum-classical feedback optimization to 'self-calibrate' the programmable quantum sensor with comparable performance. This ability illustrates that this next generation of quantum sensor can be used without previous knowledge of the device or its noise environment.
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Affiliation(s)
| | | | | | - Raphael Kaubruegger
- Institute for Quantum Optics and Quantum Information, Innsbruck, Austria.,Center for Quantum Physics, Innsbruck, Austria
| | - Denis V Vasilyev
- Institute for Quantum Optics and Quantum Information, Innsbruck, Austria.,Center for Quantum Physics, Innsbruck, Austria
| | - Rick van Bijnen
- Institute for Quantum Optics and Quantum Information, Innsbruck, Austria.,Center for Quantum Physics, Innsbruck, Austria
| | | | - Peter Zoller
- Institute for Quantum Optics and Quantum Information, Innsbruck, Austria.,Center for Quantum Physics, Innsbruck, Austria
| | - Rainer Blatt
- Institut für Experimentalphysik, Innsbruck, Austria.,Institute for Quantum Optics and Quantum Information, Innsbruck, Austria
| | - Thomas Monz
- Institut für Experimentalphysik, Innsbruck, Austria. .,Alpine Quantum Technologies, Innsbruck, Austria.
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Kubica A, Demkowicz-Dobrzański R. Using Quantum Metrological Bounds in Quantum Error Correction: A Simple Proof of the Approximate Eastin-Knill Theorem. PHYSICAL REVIEW LETTERS 2021; 126:150503. [PMID: 33929237 DOI: 10.1103/physrevlett.126.150503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 02/24/2021] [Indexed: 06/12/2023]
Abstract
We present a simple proof of the approximate Eastin-Knill theorem, which connects the quality of a quantum error-correcting code (QECC) with its ability to achieve a universal set of transversal logical gates. Our derivation employs powerful bounds on the quantum Fisher information in generic quantum metrological protocols to characterize the QECC performance measured in terms of the worst-case entanglement fidelity. The theorem is applicable to a large class of decoherence models, including erasure and depolarizing noise. Our approach is unorthodox, as instead of following the established path of utilizing QECCs to mitigate noise in quantum metrological protocols, we apply methods of quantum metrology to explore the limitations of QECCs.
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Affiliation(s)
- Aleksander Kubica
- Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada
- Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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