Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session TT04: V: General Quantum Information and FoundationsUndergrad Friendly
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Sponsoring Units: DQI Chair: Shampa Sarkar, Tata Consultancy Services Room: Virtual Room 4 |
Tuesday, March 21, 2023 3:30PM - 3:42PM |
TT04.00001: Spin chain transformations under continuous driving fields Hudaiba Soomro, Adam Zaman Chaudhry A continuous, sinusoidal control field is used to suitably transform quantum spin chains. In particular, we are able to transform the quantum Ising chain to the quantum XY model, and the XY model to the XYZ spin chain. Our applied control field can also mitigate the effect of noise on the spin chain. We show how these spin chain transformations can be useful for quantum state transfer as well as entanglement generation. |
Tuesday, March 21, 2023 3:42PM - 3:54PM |
TT04.00002: Simulating quantum circuits using efficient tensor network contraction algorithms with subexponential upper bound Thorsten B Wahl, Sergii Strelchuk We derive a rigorous upper bound on the classical computation time of finite-ranged tensor network contractions in d ≥ 2 dimensions. By means of the Sphere Separator Theorem, we are able to take advantage of the structure of quantum circuits to speed up contractions to show that quantum circuits of single-qubit and finite-ranged two-qubit gates can be classically simulated in subexponential time in the number of gates. In many practically relevant cases this beats standard simulation schemes. Moreover, our algorithm leads to speedups of several orders of magnitude over naive contraction schemes for two-dimensional quantum circuits on as little as an 8 × 8 lattice. We obtain similarly efficient contraction schemes for Google's Sycamore-type quantum circuits, instantaneous quantum polynomial-time circuits, and non-homogeneous (2+1)-dimensional random quantum circuits. |
Tuesday, March 21, 2023 3:54PM - 4:06PM |
TT04.00003: Quantum Uncertainty Principles for Measurements with Interventions Mile Gu, Yunlong Xiao, Yuxiang Yang, Liu Qing, Ximing Wang Heisenberg's uncertainty principle encapsulates an iconic difference |
Tuesday, March 21, 2023 4:06PM - 4:18PM |
TT04.00004: Quantum observables in accelerated frames: observing particles beyond the Rindler horizon Riccardo Falcone, Claudio C Conti We compute the Wigner characteristic function for particle states prepared by an inertial observer and detected by an accelerated observer. This provides an explicit Wigner formulation of Minkowski particle states for the non-inertial observer and a way to derive mean values of quantum observables in the accelerated frame. |
Tuesday, March 21, 2023 4:18PM - 4:30PM |
TT04.00005: The wave-particle duality of the qudit-based quantum space as demonstrated by the wave-like quantum functionals Zixuan Hu, Sabre Kais Qudits are the fundamental building blocks of quantum information and quantum computation – usually the 2-level qubits are used, but recently there are growing interests in generalizing to higher d-level qudit systems. In this work, we propose the wave-particle duality of the qudit-based quantum space and the wave-like quantum functionals are new fundamental physical realities that have not been previously considered. The theory was developed by recognizing the deep connection between the usual momentum-position duality lying at the foundation of quantum physics, and the new duality between the qudit functionals and qudit states – both are examples of the mathematical concept of Pontryagin duality. The quantum functionals are quantum objects generated by the basis qudit functionals, which are the duals of the basis qudit states. The quantum states and quantum functionals are related by a Fourier transform and an entropic uncertainty principle can be defined between the dual representations. The quantum functionals are not just mathematical constructs but have clear physical meanings and quantum circuit realizations. Connecting the partition interpretation of the quantum functionals to the effects of quantum gates may allow systematic understanding of quantum circuits. |
Tuesday, March 21, 2023 4:30PM - 4:42PM |
TT04.00006: Quantum Conditional Probabilities and New Measures of Quantum Information David Kagan I define a form of quantum conditional probability and related measures of quantum information. These quantities are quite natural in the context of dynamical quantum systems, shedding light on important results in quantum information theory such as the Holevo bound. |
Tuesday, March 21, 2023 4:42PM - 4:54PM |
TT04.00007: A two-component Bose-Einstein condensate can 'bypass' the no-cloning theorem Shouvik Datta No-cloning theorem in quantum cryptography prevents an eavesdropper from perfectly duplicating any arbitrary quantum state. Here we argue that a scheme for producing a two-component quantum superposition of Bose-Einstein condensates can, in principle, generate N bosonic clones of any single quantum state at large N thermodynamic limit and thus operationally 'bypass' the restrictions imposed by the above mentioned theorem. It is possible because the quantum statistical nature of this 'cloning operation' does not require the unitary evolution of standard quantum mechanics. Such operationally executable 'perfect' quantum cloning machine will significantly impact existing understanding of quantum cryptography and also that of relativity, in general, by allowing superluminal signaling. |
Tuesday, March 21, 2023 4:54PM - 5:06PM |
TT04.00008: Quantum Wasserstein distance based on an optimization over separable states Geza Toth, Jozsef Pitrik We define the quantum Wasserstein distance such that the optimization is carried out over bipartite separable states rather than bipartite quantum states in general, and examine its properties. Surprisingly, we find that its self-distance is related to the quantum Fisher information. We discuss how the quantum Wasserstein distance introduced is connected to criteria detecting quantum entanglement. We define variance-like quantities that can be obtained from the quantum Wasserstein distance by replacing the minimization over quantum states by a maximization. We extend our results to a family of generalized quantum Fisher information. |
Tuesday, March 21, 2023 5:06PM - 5:18PM |
TT04.00009: Effects of dipolar coupling on an entanglement storage device Saptarshi Saha, Rangeet Bhattacharyya Quantum computation requires efficient long-term storage devices to preserve quantum states. An attractive candidate for such storage devices is qubits connected to a common dissipative environment. Multiple qubits in a common environment can have a persistent entanglement. Hence these systems can be used as an efficient storage device of entanglement. However, the existence of a common environment often requires the physical proximity of the qubits and hence results in direct dipolar coupling between the qubits. In this presentation, we will explicitly show the effects of the dipolar coupling on the environment-induced entanglement using a recently-proposed fluctuation-regulated quantum master equation [A.Chakrabarti and R. Bhattacharyya, Phys. Rev. A 97, 063837 (2018)]. Our result indicates that non-secular part of the dipolar coupling results in reduced persistent entanglement and hence less efficiency of the storage devices. We will also discuss the properties of efficient storage devices that mitigate the detrimental effects of the dipolar coupling on the stored entanglement. |
Tuesday, March 21, 2023 5:18PM - 5:30PM |
TT04.00010: Shapes of quantum entanglement Bart Olsthoorn Persistent homology is a relatively new computational tool to study shapes that are present at different length scales in discrete data. We use this method to study the structure of entanglement entropy in quantum states (obtained through exact diagonalization). The shapes in the entanglement structure are summarized in a barcode that reveals geometric and topological information. We show that abrupt changes in the barcode indicate a quantum phase transition for the example of a transverse-field Ising chain. Beyond this basic demonstration, we also analyze the XXZ spin chain in a random tranverse field, providing a new angle to study the elusive many-body localization transition. Finally, we discuss the promising future applications of this modern computational approach. |
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