scholarly journals Qubit spin ice

Science ◽  
2021 ◽  
pp. eabe2824
Author(s):  
Andrew D. King ◽  
Cristiano Nisoli ◽  
Edward D. Dahl ◽  
Gabriel Poulin-Lamarre ◽  
Alejandro Lopez-Bezanilla
Keyword(s):  
Thermal Fluctuations ◽  
Two Dimensions ◽  
Quantum Spin ◽  
Fine Tuning ◽  
Spin Ice ◽  
Spin Liquids ◽  
Artificial Spin Ice ◽  
Emergent Phenomena ◽  
Degeneracy Point

Artificial spin ices are frustrated spin systems that can be engineered, wherein fine tuning of geometry and topology has allowed the design and characterization of exotic emergent phenomena at the constituent level. Here we report a realization of spin ice in a lattice of superconducting qubits. Unlike conventional artificial spin ice, our system is disordered by both quantum and thermal fluctuations. The ground state is classically described by the ice rule, and we achieve control over a fragile degeneracy point leading to a Coulomb phase. The ability to pin individual spins allows us to demonstrate Gauss's law for emergent effective monopoles in two dimensions. The demonstrated qubit control lays the groundwork for potential future study of topologically protected artificial quantum spin liquids.

scholarly journals Characterization of quantum spin liquids and their spinon band structures via functional renormalization

2019 ◽  
Vol 99 (10) ◽  
Author(s):  
Max Hering ◽  
Jonas Sonnenschein ◽  
Yasir Iqbal ◽  
Johannes Reuther
Keyword(s):  
Quantum Spin ◽  
Spin Liquids ◽  
Band Structures ◽  
Quantum Spin Liquids

scholarly journals Parent Hamiltonian reconstruction of Jastrow-Gutzwiller wavefunctions

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Xhek Turkeshi ◽  
Marcello Dalmonte
Keyword(s):  
Parameter Space ◽  
Two Dimensions ◽  
Quantum Spin ◽  
Wave Functions ◽  
Strongly Correlated ◽  
Spin Liquids ◽  
Experimental Realization ◽  
Energy Field ◽  
Quantum Spin Liquids ◽  
Quantum Spin Liquid

Variational wave functions have been a successful tool to investigate the properties of quantum spin liquids. Finding their parent Hamiltonians is of primary interest for the experimental realization of these strongly correlated phases, and for gathering additional insights on their stability. In this work, we systematically reconstruct approximate spin-chain parent Hamiltonians for Jastrow-Gutzwiller wave functions, which share several features with quantum spin liquid wave functions in two dimensions. Firstly, we determine the different phases encoded in the parameter space through their correlation functions and entanglement properties. Secondly, we apply a recently proposed entanglement-guided method to reconstruct parent Hamiltonians to these states, which constrains the search to operators describing relativistic low-energy field theories - as expected for deconfined phases of gauge theories relevant to quantum spin liquids. The quality of the results is discussed using different quantities and comparing to exactly known parent Hamiltonians at specific points in parameter space. Our findings provide guiding principles for experimental Hamiltonian engineering of this class of states.

scholarly journals Synthesis, floating zone crystal growth and characterization of the quantum spin ice Pr2Zr2O7 pyrochlore

2014 ◽  
Vol 402 ◽  
pp. 291-298 ◽  
Author(s):  
S.M. Koohpayeh ◽  
J.-J. Wen ◽  
B.A. Trump ◽  
C.L. Broholm ◽  
T.M. McQueen
Keyword(s):  
Crystal Growth ◽  
Quantum Spin ◽  
Floating Zone ◽  
Spin Ice ◽  
Quantum Spin Ice

scholarly journals Chain-based order and quantum spin liquids in dipolar spin ice

2015 ◽  
Vol 92 (9) ◽  
Author(s):  
P. A. McClarty ◽  
O. Sikora ◽  
R. Moessner ◽  
K. Penc ◽  
F. Pollmann ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Spin Ice ◽  
Spin Liquids ◽  
Quantum Spin Liquids
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