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A High-Efficiency, Low-Noise Platform for Microwave-to-Optical Quantum Transduction
A High-Efficiency, Low-Noise Platform for Microwave-to-Optical Quantum Transduction
A High-Efficiency, Low-Noise Platform for Microwave-to-Optical Quantum Transduction

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105204
ISBN  
9798291528303
DDC  
530
저자명  
Sonar, Sameer.
서명/저자  
A High-Efficiency, Low-Noise Platform for Microwave-to-Optical Quantum Transduction
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
175 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
주기사항  
Advisor: Painter, Oskar J.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약Quantum computing platforms based on superconducting qubits have achieved remarkable progress in recent years, with significant advancements in quantum error correction, coherence times, and gate fidelities. However, the path to large-scale, fault-tolerant quantum computing faces a critical scaling bottleneck: the physical limits of single-chip architectures. Integrating millions of qubits on a single superconducting chip presents formidable engineering challenges, including increased thermal load, crosstalk, and complex wiring within the dilution refrigerator.A promising approach to overcome these limitations is to interconnect multiple smaller superconducting quantum processors via a quantum network, allowing for distributed quantum computation. In this context, telecom-wavelength optical photons (around 1550 nm or 200 THz) are particularly attractive for transmitting quantum information across long distances due to their low propagation loss in optical fiber and negligible thermal occupation at room temperature. However, superconducting qubits typically operate at microwave frequencies (around 5-10 GHz), leading to a fundamental mismatch in operating frequencies that prevents direct coupling between these two domains.This five-orders-of-magnitude frequency mismatch poses a major challenge for coherent quantum transduction, requiring a highly efficient, low-noise interface to faithfully convert quantum states between microwave and optical photons. A leading approach for transduction involves piezo-optomechanical platforms, where an intermediary acoustic resonator facilitates the conversion between microwave photons and microwave acoustic phonons, which are then converted to optical photons. However, existing designs often suffer from poor conversion efficiency and added noise due to geometric constraints and substrate heating, limiting their scalability for real-world quantum networks. In the first part of this thesis, I will introduce an optimized two-dimensional optomechanical crystal platform with a side-coupled optical waveguide. This geometry significantly improves the noise-efficiency metric for optical photon-acoustic phonon conversion. I will then discuss the integration of piezo-acoustic circuits into these two-dimensional crystals to realize a full microwave-to-optical transducer. I will cover the underlying design principles, fabrication processes, and preliminary measurement results, highlighting the potential of this platform for enabling future quantum communication and distributed quantum computing.Another critical challenge in quantum networking is the frequency mismatch that arises when attempting to interfere photons emitted by different quantum nodes. This mismatch is primarily caused by variations in fabrication processes. In the second part of this thesis, I will present a novel post-fabrication tuning technique for piezo-optomechanical transducers, based on atomic force microscope (AFM) nano-oxidation. By applying a voltage bias to the AFM tip, we can selectively oxidize the surface of the dielectric device, introducing a controlled, localized change in refractive index and mechanical properties. This allows for precise tuning of both optical and acoustic resonance frequencies. I will demonstrate the effectiveness of this technique through experimental results at both room and cryogenic temperatures, highlighting its potential for scaling quantum networks.
일반주제명  
Applied physics
일반주제명  
Quantum physics
일반주제명  
Optics
키워드  
Superconducting qubit
키워드  
Optical photons
기타저자  
California Institute of Technology Engineering and Applied Science
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798291528303
■035    ▼a(MiAaPQ)AAI32259592
■035    ▼a(MiAaPQ)Caltech17498
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aSonar,  Sameer.▼0(orcid)0000-0002-1082-9360
■24512▼aA  High-Efficiency,  Low-Noise  Platform  for  Microwave-to-Optical  Quantum  Transduction
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a175  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  Painter,  Oskar  J.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aQuantum  computing  platforms  based  on  superconducting  qubits  have  achieved  remarkable  progress  in  recent  years,  with  significant  advancements  in  quantum  error  correction,  coherence  times,  and  gate  fidelities.  However,  the  path  to  large-scale,  fault-tolerant  quantum  computing  faces  a  critical  scaling  bottleneck:  the  physical  limits  of  single-chip  architectures.  Integrating  millions  of  qubits  on  a  single  superconducting  chip  presents  formidable  engineering  challenges,  including  increased  thermal  load,  crosstalk,  and  complex  wiring  within  the  dilution  refrigerator.A  promising  approach  to  overcome  these  limitations  is  to  interconnect  multiple  smaller  superconducting  quantum  processors  via  a  quantum  network,  allowing  for  distributed  quantum  computation.  In  this  context,  telecom-wavelength  optical  photons  (around  1550  nm  or  200  THz)  are  particularly  attractive  for  transmitting  quantum  information  across  long  distances  due  to  their  low  propagation  loss  in  optical  fiber  and  negligible  thermal  occupation  at  room  temperature.  However,  superconducting  qubits  typically  operate  at  microwave  frequencies  (around  5-10  GHz),  leading  to  a  fundamental  mismatch  in  operating  frequencies  that  prevents  direct  coupling  between  these  two  domains.This  five-orders-of-magnitude  frequency  mismatch  poses  a  major  challenge  for  coherent  quantum  transduction,  requiring  a  highly  efficient,  low-noise  interface  to  faithfully  convert  quantum  states  between  microwave  and  optical  photons.  A  leading  approach  for  transduction  involves  piezo-optomechanical  platforms,  where  an  intermediary  acoustic  resonator  facilitates  the  conversion  between  microwave  photons  and  microwave  acoustic  phonons,  which  are  then  converted  to  optical  photons.  However,  existing  designs  often  suffer  from  poor  conversion  efficiency  and  added  noise  due  to  geometric  constraints  and  substrate  heating,  limiting  their  scalability  for  real-world  quantum  networks.  In  the  first  part  of  this  thesis,  I  will  introduce  an  optimized  two-dimensional  optomechanical  crystal  platform  with  a  side-coupled  optical  waveguide.  This  geometry  significantly  improves  the  noise-efficiency  metric  for  optical  photon-acoustic  phonon  conversion.  I  will  then  discuss  the  integration  of  piezo-acoustic  circuits  into  these  two-dimensional  crystals  to  realize  a  full  microwave-to-optical  transducer.  I  will  cover  the  underlying  design  principles,  fabrication  processes,  and  preliminary  measurement  results,  highlighting  the  potential  of  this  platform  for  enabling  future  quantum  communication  and  distributed  quantum  computing.Another  critical  challenge  in  quantum  networking  is  the  frequency  mismatch  that  arises  when  attempting  to  interfere  photons  emitted  by  different  quantum  nodes.  This  mismatch  is  primarily  caused  by  variations  in  fabrication  processes.  In  the  second  part  of  this  thesis,  I  will  present  a  novel  post-fabrication  tuning  technique  for  piezo-optomechanical  transducers,  based  on  atomic  force  microscope  (AFM)  nano-oxidation.  By  applying  a  voltage  bias  to  the  AFM  tip,  we  can  selectively  oxidize  the  surface  of  the  dielectric  device,  introducing  a  controlled,  localized  change  in  refractive  index  and  mechanical  properties.  This  allows  for  precise  tuning  of  both  optical  and  acoustic  resonance  frequencies.  I  will  demonstrate  the  effectiveness  of  this  technique  through  experimental  results  at  both  room  and  cryogenic  temperatures,  highlighting  its  potential  for  scaling  quantum  networks.
■590    ▼aSchool  code:  0037.
■650  4▼aApplied  physics
■650  4▼aQuantum  physics
■650  4▼aOptics
■653    ▼aSuperconducting  qubit
■653    ▼aOptical  photons
■690    ▼a0752
■690    ▼a0599
■690    ▼a0215
■71020▼aCalifornia  Institute  of  Technology▼bEngineering  and  Applied  Science.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359728▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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