James A. Mingo, Alexandru Nica
We consider the concept of a q-circular system, which is a deformation of the circular system from free probability, taking place in the framework of the so-called 'q-commutation relations'. We show that certain averages of random unitaries in non-commutative tori behave asymptotically like a q-circular system.
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Around 1980 Connes extended the notions of geometry to the non-commutative setting. Since then {\it non-commutative geometry} has turned into a very active area of mathematical research. As a first non-trivial example of a non-commutative manifold Connes discussed subalgebras of rotation algebras, the so-called {\it non-commutative tori}. In the last two decades researchers have unrevealed the relevance of non-commutative tori in a variety of mathematical and physical fields. In a recent paper we have pointed out that non-commutative tori appear very naturally in Gabor analysis. In the present…
We consider a generic curved non-commutative torus extending the notion of conformally deformed non-commutative torus from \cite{Connes-Tretkoff}. In general, a curved non-commutative torus is no longer represented by a spectral triple, not even by a twisted spectral triple. Therefore, the geometry of this manifold is governed by a positive second order differential operator (Laplace-Betrami operator) rather than a first order differential operator (Dirac operator). For this manifold, we prove an asymptotic expansion of the heat semi-group generated by Laplace-Beltrami operator and provide an …
If X is a full, finitely generated, projective module over a non-commutative torus, the Yang-Mills functional attains its minimum exactly on the flat connections on X. We classify the flat connections on modules admitting integrable connections.
Asymptotic freeness through unitaries generated by polynomials of Wigner matrices
本文研究确定性矩阵与独立Wigner矩阵自伴多项式处函数乘积的确定性近似与波动控制，并证明由Wigner矩阵多项式生成的量子演化在长时间下产生渐近自由性。
We explicitly compute the local invariants (heat kernel coefficients) of a conformally deformed non-commutative $d$-torus using multiple operator integrals. We derive a recursive formula that easily produces an explicit expression for the local invariants of any order $k$ and in any dimension $d$. Our recursive formula can conveniently produce all formulas related to the modular operator, which before were obtained in incremental steps for $d\in\{2,4\}$ and $k\in\{0,2,4\}$. We exemplify this by writing down some known ($k=2$, $d=2$) and some novel ($k=2$, $d\geq 3$) formulas in the modular ope…
Norm of matrix-valued polynomials in random unitaries and permutations
本文研究了系数为矩阵的随机非交换多项式的算子范数，证明了其与自由群冯·诺伊曼代数生成元对应范数在大$N$极限下的一致逼近性，并给出了该多项式范数的通用定量下界，从而推广了Alon-Boppana下界。
Finite Riesz products and Ornstein non-inequalities on quantum tori
本文研究了量子环上有限里斯茨积的构造，并基于此推导出非交换奥本海姆非等式。
Symmetrized non-commutative tori revisited
本文借助 Natsume 正合序列计算 Z_2 翻转作用下非交换环面交叉积的 K-理论，给出 K_0 显式基，并对单环面确定其交叉积的同构类。
The soft tori constitute a continuous deformation, in a very precise sense, from the commutative C*-algebra C(T^2) to the highly non-commutative C*-algebra C*(F_2). Since both of these C*-algebras are known to have a separating family of finite dimensional representations, it is natural to ask whether that is also the case for the soft tori. We show that this is in fact the case.
A duality theory of bundles of C$^*$-algebras whose fibres are twisted transformation group algebras is established. Classical T-duality is obtained as a special case, where all fibres are commutative tori, i.e. untwisted group algebras for $\Z^n$. Our theory also includes the bundles considered by Mathai and Rosenberg in their work on non-commutative T-duals, in which they allow twisted group algebras on one side of the duality.
As many will agree, it feels good to complement a cup of tea by a donut or two. This sweet relationship is also a guiding principle of non-commutative geometry known as Serre Theorem. We explain the algebra behind this theorem and prove that elliptic curves are complementary to the so-called non-commutative tori.
Orlicz-Schatten Factorizations for Non-Commutative Sobolev Embeddings
本研究提出通过新定义的Orlicz-Schatten序列理想分解量子环面上非交换Sobolev空间嵌入的框架，建立量子拉普拉斯嵌入的求和算子刻画，证明分解定理的存在性与最优性，并给出其在非交换PDE正则性、量子信息度量中的应用，拓展了相关结构在泛函分析与数学物理中的应用范围。
A non-commutative non-selfadjoint random variable z is called R-diagonal, if its *-distribution is invariant under multiplication by free unitaries: if a unitary w is *-free from z, then the *-distribution of z is the same as that of wz. Using Voiculescu's microstates definition of free entropy, we show that the R-diagonal elements are characterized as having the largest free entropy among all variables y with a fixed distribution of y^*y. More generally, let Z be a d*d matrix whose entries are non-commutative random variables X_{ij}. Then the free entropy of the family {X_{ij}} of the entries…
For any irrational theta and rational number p/q such that q|qtheta-p|<1, a projection e of trace q|qtheta-p| is constructed in the the irrational rotation algebra A_theta that is invariant under the Fourier transform. (The latter is the order four automorphism U mapped to V, V mapped to U^{-1}, where U, V are the canonical unitaries generating A_theta.) Further, the projection e is approximately central, the cut down algebra eA_theta e contains a Fourier invariant q x q matrix algebra whose unit is e, and the cut downs eUe, eVe are approximately inside the matrix algebra. (In particular, ther…
Hybrid Oscillator-Qudit Quantum Processors: stabilizer states, stabilizer codes, symplectic operations, and non-commutative geometry
本文提出混合振子-量子态量子处理器，通过非交换几何和辛操作构建稳定态和纠错码，实现非对易位移测量和优于传统GKP码的纠错性能。
Shafarevich-Tate groups of abelian varieties
该研究借助阿贝尔簇与高维非交换环面的对应，推导了阿贝尔簇的Shafarevich-Tate群的两种同构结构，并详细探讨了带复乘的椭圆曲线的相关情形。
A reconstruction theorem for Connes-Landi deformations of commutative spectral triples
本文提出了一种关于Connes-Landi变形的谱三元组的抽象定义，并证明其在进一步变形下的良好行为，同时展示了其在量化和去量化过程中的应用。
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