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Finding and Building Algebraic Structures in Finite-Dimensional Hilbert Spaces for Quantum Computation and Quantum Information- [electronic resource]
Finding and Building Algebraic Structures in Finite-Dimensional Hilbert Spaces for Quantum...
Finding and Building Algebraic Structures in Finite-Dimensional Hilbert Spaces for Quantum Computation and Quantum Information- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214100426
ISBN  
9798379611125
DDC  
530
저자명  
Lin, Robert Henry.
서명/저자  
Finding and Building Algebraic Structures in Finite-Dimensional Hilbert Spaces for Quantum Computation and Quantum Information - [electronic resource]
발행사항  
[S.l.]: : Harvard University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(148 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
주기사항  
Advisor: Jaffe, Arthur.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약In this dissertation, we investigate algebraic structures in finite-dimensional Hilbert spaces, as concerns quantum computation and quantum information, as well as these structures' applications to lattices.On the quantum computation side, we develop an algebraic framework of axioms which abstracts various high-level properties of multi-qudit representations of generalized Clifford algebras. We further construct an explicit model and prove that it satisfies these axioms. Subsequently, we develop a graphical calculus for multi-qudit computations with generalized Clifford algebras, using the algebraic framework developed. We build our graphical calculus out of a fixed set of graphical primitives defined by algebraic expressions constructed out of elements of a given generalized Clifford algebra, a graphical primitive corresponding to the ground state, and also graphical primitives corresponding to projections onto the ground state of each qudit. We establish many algebraic identities, including a novel algebraic proof of a Yang-Baxter equation. We also derive a new identity for the braid elements, which is key to our proofs. We then use the Yang-Baxter equation proof to resolve an open question of Cobanera and Ortiz. We demonstrate that in many cases, the verification of involved vector identities can be reduced to the combinatorial application of two basic vector identities. In addition, we show how to explicitly compute various vector states in an efficient manner using algebraic methods.On the quantum information side, we introduce a new decomposition of quantum channels acting on group algebras, which we term Kraus-like operator decompositions (Kraus-like decompositions for short). An important motivation for this new decomposition is a general nonexistence result that we show for Kraus operator decompositions for quantum channels in this setting. We show that the notion of convex Kraus-like operator decompositions (in which the coefficients in the sum decomposition are nonnegative and satisfy a sum rule) that are induced by the irreducible characters of a finite group is equivalent to the notion of a conditionally negative-definite length when the length is a class function. For a general finite group G, we prove a stability condition which shows that if the semigroup associated with a length has a convex Kraus-like operator decomposition for all t 0 small enough, then it has a convex Kraus-like operator decomposition for all time t 0. Using the stability condition, we show that for a general finite group, conditional negativity of the length function is equivalent to a set of semidefinite linear constraints on the length function. By a result of Schoenberg, our result implies that in the group algebra setting, a semigroup Pt induced by a length function which is a class function is a quantum channel for all t ≥ 0 if and only if it possesses a convex Kraus-like operator decomposition for all t 0.Finally, motivated by the importance of lattice problems in quantum cryptography, we extend the algebraic framework for multi-qudit representations of generalized Clifford algebras to lattices in ℤdP . We show that under suitable number-theoretic conditions, the subalgebra induced by a lattice has trivial center. Under the trivial center constraint, we construct for pairs of lattice vectors satisfying an algebraic constraint a unitary operator based on the product of generalized Clifford algebra generators associated to each lattice vector.
일반주제명  
Physics.
일반주제명  
Quantum physics.
일반주제명  
Mathematics.
키워드  
Generalized Clifford algebras
키워드  
Group algebras
키워드  
Lattices
키워드  
Quantum channels
키워드  
Quantum computation
키워드  
Yang-Baxter equation
기타저자  
Harvard University Physics
기본자료저록  
Dissertations Abstracts International. 84-12B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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 008240612s2023      us  |||||||||||||||c||eng  d
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■00520240214100426
■006m          o    d                
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■020    ▼a9798379611125
■035    ▼a(MiAaPQ)AAI30489612
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aLin,  Robert  Henry.▼0(orcid)0000-0002-9273-011X
■24510▼aFinding  and  Building  Algebraic  Structures  in  Finite-Dimensional  Hilbert  Spaces  for  Quantum  Computation  and  Quantum  Information▼h[electronic  resource]
■260    ▼a[S.l.]:▼bHarvard  University.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(148  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  84-12,  Section:  B.
■500    ▼aAdvisor:  Jaffe,  Arthur.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aIn  this  dissertation,  we  investigate  algebraic  structures  in  finite-dimensional  Hilbert  spaces,  as  concerns  quantum  computation  and  quantum  information,  as  well  as  these  structures'  applications  to  lattices.On  the  quantum  computation  side,  we  develop  an  algebraic  framework  of  axioms  which  abstracts  various  high-level  properties  of  multi-qudit  representations  of  generalized  Clifford  algebras.  We  further  construct  an  explicit  model  and  prove  that  it  satisfies  these  axioms.  Subsequently,  we  develop  a  graphical  calculus  for  multi-qudit  computations  with  generalized  Clifford  algebras,  using  the  algebraic  framework  developed.  We  build  our  graphical  calculus  out  of  a  fixed  set  of  graphical  primitives  defined  by  algebraic  expressions  constructed  out  of  elements  of  a  given  generalized  Clifford  algebra,  a  graphical  primitive  corresponding  to  the  ground  state,  and  also  graphical  primitives  corresponding  to  projections  onto  the  ground  state  of  each  qudit.  We  establish  many  algebraic  identities,  including  a  novel  algebraic  proof  of  a  Yang-Baxter  equation.  We  also  derive  a  new  identity  for  the  braid  elements,  which  is  key  to  our  proofs.  We  then  use  the  Yang-Baxter  equation  proof  to  resolve  an  open  question  of  Cobanera  and  Ortiz.  We  demonstrate  that  in  many  cases,  the  verification  of  involved  vector  identities  can  be  reduced  to  the  combinatorial  application  of  two  basic  vector  identities.  In  addition,  we  show  how  to  explicitly  compute  various  vector  states  in  an  efficient  manner  using  algebraic  methods.On  the  quantum  information  side,  we  introduce  a  new  decomposition  of  quantum  channels  acting  on  group  algebras,  which  we  term  Kraus-like  operator  decompositions  (Kraus-like  decompositions  for  short).  An  important  motivation  for  this  new  decomposition  is  a  general  nonexistence  result  that  we  show  for  Kraus  operator  decompositions  for  quantum  channels  in  this  setting.  We  show  that  the  notion  of  convex  Kraus-like  operator  decompositions  (in  which  the  coefficients  in  the  sum  decomposition  are  nonnegative  and  satisfy  a  sum  rule)  that  are  induced  by  the  irreducible  characters  of  a  finite  group  is  equivalent  to  the  notion  of  a  conditionally  negative-definite  length  when  the  length  is  a  class  function.  For  a  general  finite  group  G,  we  prove  a  stability  condition  which  shows  that  if  the  semigroup  associated  with  a  length  has  a  convex  Kraus-like  operator  decomposition  for  all  t    0  small  enough,  then  it  has  a  convex  Kraus-like  operator  decomposition  for  all  time  t    0.  Using  the  stability  condition,  we  show  that  for  a  general  finite  group,  conditional  negativity  of  the  length  function  is  equivalent  to  a  set  of  semidefinite  linear  constraints  on  the  length  function.  By  a  result  of  Schoenberg,  our  result  implies  that  in  the  group  algebra  setting,  a  semigroup  Pt  induced  by  a  length  function  which  is  a  class  function  is  a  quantum  channel  for  all  t  ≥  0  if  and  only  if  it  possesses  a  convex  Kraus-like  operator  decomposition  for  all  t    0.Finally,  motivated  by  the  importance  of  lattice  problems  in  quantum  cryptography,  we  extend  the  algebraic  framework  for  multi-qudit  representations  of  generalized  Clifford  algebras  to  lattices  in  ℤdP  .  We  show  that  under  suitable  number-theoretic  conditions,  the  subalgebra  induced  by  a  lattice  has  trivial  center.  Under  the  trivial  center  constraint,  we  construct  for  pairs  of  lattice  vectors  satisfying  an  algebraic  constraint  a  unitary  operator  based  on  the  product  of  generalized  Clifford  algebra  generators  associated  to  each  lattice  vector.
■590    ▼aSchool  code:  0084.
■650  4▼aPhysics.
■650  4▼aQuantum  physics.
■650  4▼aMathematics.
■653    ▼aGeneralized  Clifford  algebras
■653    ▼aGroup  algebras
■653    ▼aLattices
■653    ▼aQuantum  channels
■653    ▼aQuantum  computation
■653    ▼aYang-Baxter  equation
■690    ▼a0605
■690    ▼a0599
■690    ▼a0405
■71020▼aHarvard  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g84-12B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16932202▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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