Publications

2014

  • T. F. Demarie, T. Linjordet, N. C. Menicucci, and G. K. Brennen, “Detecting topological entanglement entropy in a lattice of quantum harmonic oscillators,” New journal of physics, vol. 16, iss. 8, p. 85011, 2014.
    [Bibtex]
    @article{1367-2630-16-8-085011,
    author={Tommaso F Demarie and Trond Linjordet and Nicolas C Menicucci and Gavin K Brennen},
    title={Detecting topological entanglement entropy in a lattice of quantum harmonic oscillators},
    journal={New Journal of Physics},
    volume={16},
    number={8},
    pages={085011},
    url={http://stacks.iop.org/1367-2630/16/i=8/a=085011},
    year={2014},
    abstract={The Kitaev surface code model is the most studied example of a topologically ordered phase and typically involves four-spin interactions on a two-dimensional surface. A universal signature of this phase is topological entanglement entropy (TEE), but due to low signal to noise, it is extremely difficult to observe in these systems, and one usually resorts to measuring anyonic statistics of excitations or non-local string operators to reveal the order. We describe a continuous-variable analog to the surface code using quantum harmonic oscillators on a two-dimensional lattice, which has the distinctive property of needing only two-body nearest-neighbor interactions for its creation. Though such a model is gapless, it satisfies an area law and the ground state can be simply prepared by measurements on a finitely squeezed and gapped two-dimensional cluster-state without topological order. Asymptotically, the continuous variable surface code TEE grows linearly with the squeezing parameter and a recently discovered non-local quantity, the topological logarithmic negativity, behaves analogously. We also show that the mixed-state generalization of the TEE, the topological mutual information, is robust to some forms of state preparation error and can be detected simply using single-mode quadrature measurements. Finally, we discuss scalable implementation of these methods using optical and circuit-QED technology.}
    }
  • [DOI] L. Chen, M. Aulbach, and M. Hajdušek, “Comparison of different definitions of the geometric measure of entanglement,” Phys. rev. a, vol. 89, p. 42305, 2014.
    [Bibtex]
    @article{cah14,
    title = {Comparison of different definitions of the geometric measure of entanglement},
    author = {Chen, Lin and Aulbach, Martin and Hajdu\v{s}ek, Michal},
    journal = {Phys. Rev. A},
    volume = {89},
    issue = {4},
    pages = {042305},
    numpages = {20},
    year = {2014},
    month = {Apr},
    publisher = {American Physical Society},
    doi = {10.1103/PhysRevA.89.042305},
    url = {http://link.aps.org/doi/10.1103/PhysRevA.89.042305}
    }
  • [DOI] L. Chen, J. Chen, D. Z. Djokovic, and B. Zeng, “Universal subspaces for local unitary groups of fermionic systems,” Communications in mathematical physics, pp. 1-23, 2014.
    [Bibtex]
    @article{ccd14,
    year={2014},
    issn={0010-3616},
    journal={Communications in Mathematical Physics},
    doi={10.1007/s00220-014-2187-6},
    title={Universal Subspaces for Local Unitary Groups of Fermionic Systems},
    url={http://dx.doi.org/10.1007/s00220-014-2187-6},
    publisher={Springer Berlin Heidelberg},
    author={Chen, Lin and Chen, Jianxin and Djokovic, Dragomir Z and Zeng, Bei},
    pages={1-23}
    }
  • [DOI] J. Chen, L. Chen, and B. Zeng, “Unextendible product basis for fermionic systems,” Journal of mathematical physics, vol. 55, iss. 8, p. -, 2014.
    [Bibtex]
    @article{ccz14,
    author = "Chen, Jianxin and Chen, Lin and Zeng, Bei",
    title = "Unextendible product basis for fermionic systems",
    journal = "Journal of Mathematical Physics",
    year = "2014",
    volume = "55",
    number = "8",
    eid = 082207,
    pages = "-",
    url = "http://scitation.aip.org/content/aip/journal/jmp/55/8/10.1063/1.4893358",
    doi = "10.1063/1.4893358"
    }
  • [DOI] L. Chen, D. ‡Djokovic, M. Grassl, and B. Zeng, “Canonical form of three-fermion pure-states with six single particle states,” Journal of mathematical physics, vol. 55, iss. 8, p. -, 2014.
    [Bibtex]
    @article{cdg14,
    author = "Chen, Lin and ‡Djokovic, Dragomir and Grassl, Markus and Zeng, Bei",
    title = "Canonical form of three-fermion pure-states with six single particle states",
    journal = "Journal of Mathematical Physics",
    year = "2014",
    volume = "55",
    number = "8",
    eid = 082203,
    pages = "-",
    url = "http://scitation.aip.org/content/aip/journal/jmp/55/8/10.1063/1.4892103",
    doi = "10.1063/1.4892103"
    }
  • L. Chen, M. Aulbach, and M. Hajdušek, “A comparison of old and new definitions of the geometric measure of entanglement,” Phys. rev. a, vol. 89, p. 42305, 2014.
    [Bibtex]
    @Article{chen14,
    author = "L. Chen and M. Aulbach and M. Hajdu\v{s}ek",
    title = "A comparison of old and new definitions of the geometric measure of entanglement",
    journal = "Phys. Rev. A",
    volume = "89",
    pages = "042305",
    year = "2014",
    }
  • [DOI] L. Chen and L. Yu, “On the schmidt-rank-three bipartite and multipartite unitary operator,” Annals of physics, p. -, 2014.
    [Bibtex]
    @article{Chen2014,
    title = "On the Schmidt-rank-three bipartite and multipartite unitary operator ",
    journal = "Annals of Physics ",
    volume = "",
    number = "0",
    pages = " - ",
    year = "2014",
    note = "",
    issn = "0003-4916",
    doi = "10.1016/j.aop.2014.09.026",
    url = "http://www.sciencedirect.com/science/article/pii/S0003491614002863",
    author = "Lin Chen and Li Yu",
    keywords = "Controlled unitary",
    keywords = "Nonlocal unitary",
    keywords = "Gate decomposition",
    keywords = "Operator Schmidt decomposition",
    keywords = "Quantum gates "
    }
  • L. Chen and D. Z. Djokovic, “Boundary of the set of separable states,” Arxiv preprint arxiv:1404.0738, 2014.
    [Bibtex]
    @article{chen2014boundary,
    title={Boundary of the set of separable states},
    author={Chen, Lin and Djokovic, Dragomir Z},
    journal={arXiv preprint arXiv:1404.0738},
    year={2014}
    }
  • [DOI] L. Chen and L. Yu, “Nonlocal and controlled unitary operators of schmidt rank three,” Phys. rev. a, vol. 89, p. 62326, 2014.
    [Bibtex]
    @article{cy14pra,
    title = {Nonlocal and controlled unitary operators of Schmidt rank three},
    author = {Chen, Lin and Yu, Li},
    journal = {Phys. Rev. A},
    volume = {89},
    issue = {6},
    pages = {062326},
    numpages = {8},
    year = {2014},
    month = {Jun},
    publisher = {American Physical Society},
    doi = {10.1103/PhysRevA.89.062326},
    url = {http://link.aps.org/doi/10.1103/PhysRevA.89.062326}
    }
  • H. de Guise, S. Tan, I. P. Poulin, and B. C. Sanders, “Coincidence landscapes for three-channel linear optical networks,” Physical review a, vol. 89, iss. 6, p. 63819, 2014.
    [Bibtex]
    @article{de2014coincidence,
    title={Coincidence landscapes for three-channel linear optical networks},
    author={de Guise, Hubert and Tan, Si-Hui and Poulin, Isaac P and Sanders, Barry C},
    journal={Physical Review A},
    volume={89},
    number={6},
    pages={063819},
    year={2014},
    publisher={American Physical Society}
    }
  • H. de Guise, S. Tan, I. P. Poulin, and B. C. Sanders, “Immanants for three-channel linear optical networks,” Arxiv preprint arxiv:1402.2391, 2014.
    [Bibtex]
    @article{de2014immanants,
    title={Immanants for three-channel linear optical networks},
    author={de Guise, Hubert and Tan, Si-Hui and Poulin, Isaac P and Sanders, Barry C},
    journal={arXiv preprint arXiv:1402.2391},
    year={2014}
    }
  • J. Fitzsimons and T. Vidick, “A multiprover interactive proof system for the local hamiltonian problem,” Arxiv preprint arxiv:1409.0260, 2014.
    [Bibtex]
    @article{fitzsimons2014multiprover,
    title={A multiprover interactive proof system for the local Hamiltonian problem},
    author={Fitzsimons, Joseph and Vidick, Thomas},
    journal={arXiv preprint arXiv:1409.0260},
    year={2014},
    note={To appear in Proceedings of ITCS 2015}
    }
  • T. Morimae, K. Fujii, and J. F. Fitzsimons, “Hardness of classically simulating the one-clean-qubit model,” Physical review letters, vol. 112, iss. 13, p. 130502, 2014.
    [Bibtex]
    @article{morimae2014hardness,
    title={Hardness of Classically Simulating the One-Clean-Qubit Model},
    author={Morimae, Tomoyuki and Fujii, Keisuke and Fitzsimons, Joseph F},
    journal={Physical review letters},
    volume={112},
    number={13},
    pages={130502},
    year={2014},
    publisher={American Physical Society}
    }
  • R. Nair, S. Guha, and S. Tan, “Realizable receivers for discriminating coherent and multicopy quantum states near the quantum limit,” Physical review a, vol. 89, iss. 3, p. 32318, 2014.
    [Bibtex]
    @article{nair2014realizable,
    title={Realizable receivers for discriminating coherent and multicopy quantum states near the quantum limit},
    author={Nair, Ranjith and Guha, Saikat and Tan, Si-Hui},
    journal={Physical Review A},
    volume={89},
    number={3},
    pages={032318},
    year={2014},
    publisher={American Physical Society}
    }
  • N. H. Nickerson, J. F. Fitzsimons, and S. C. Benjamin, “Freely scalable quantum technologies using cells of 5-to-50 qubits with very lossy and noisy photonic links,” Arxiv preprint arxiv:1406.0880, 2014.
    [Bibtex]
    @article{nickerson2014freely,
    title={Freely Scalable Quantum Technologies using Cells of 5-to-50 Qubits with Very Lossy and Noisy Photonic Links},
    author={Nickerson, Naomi H and Fitzsimons, Joseph F and Benjamin, Simon C},
    journal={arXiv preprint arXiv:1406.0880},
    year={2014},
    note={To appear in Physical Review X}
    }
  • Y. Ouyang, “Concatenated quantum codes can attain the quantum Gilbert-Varshamov bound,” Information theory, ieee transactions on, vol. 60, pp. 3117-3122, 2014.
    [Bibtex]
    @article{ouyang2014,
    title={Concatenated quantum codes can attain the quantum {G}ilbert-{V}arshamov bound},
    author={Ouyang, Yingkai},
    journal={Information Theory, IEEE Transactions on},
    volume={60},
    pages={3117--3122},
    year={2014}
    }
  • M. Tillmann, S. Tan, S. E. Stoeckl, B. C. Sanders, H. de Guise, R. Heilmann, S. Nolte, A. Szameit, and P. Walther, “Bosonsampling with controllable distinguishability,” Arxiv preprint arxiv:1403.3433, 2014.
    [Bibtex]
    @article{tillmann2014bosonsampling,
    title={Bosonsampling with controllable distinguishability},
    author={Tillmann, Max and Tan, Si-Hui and Stoeckl, Sarah E and Sanders, Barry C and de Guise, Hubert and Heilmann, Ren{\'e} and Nolte, Stefan and Szameit, Alexander and Walther, Philip},
    journal={arXiv preprint arXiv:1403.3433},
    year={2014}
    }
  • L. Yu, C. A. Perez-Delgado, and J. F. Fitzsimons, “Limitations on information theoretically secure quantum homomorphic encryption,” Arxiv preprint arxiv:1406.2456, 2014.
    [Bibtex]
    @article{yu2014limitations,
    title={Limitations on information theoretically secure quantum homomorphic encryption},
    author={Yu, Li and Perez-Delgado, Carlos A and Fitzsimons, Joseph F},
    journal={arXiv preprint arXiv:1406.2456},
    year={2014}
    }

2013

  • S. Barz, J. F. Fitzsimons, E. Kashefi, and P. Walther, “Experimental verification of quantum computation,” Nature physics, 2013.
    [Bibtex]
    @article{barz2013experimental,
    title={Experimental verification of quantum computation},
    author={Barz, Stefanie and Fitzsimons, Joseph F and Kashefi, Elham and Walther, Philip},
    journal={Nature Physics},
    year={2013},
    publisher={Nature Publishing Group}
    }
  • L. Chen, O. Gittsovich, K. Modi, and M. Piani, “Role of correlations in the two-body marginals problem,” Arxiv preprint arxiv:1310.1110, 2013.
    [Bibtex]
    @article{chen2013role,
    title={Role of correlations in the two-body marginals problem},
    author={Chen, Lin and Gittsovich, Oleg and Modi, Kavan and Piani, Marco},
    journal={arXiv preprint arXiv:1310.1110},
    year={2013},
    note={To appear in Physical Review A}
    }
  • V. Dunjko, J. F. Fitzsimons, C. Portmann, and R. Renner, “Composable security of delegated quantum computation,” Arxiv preprint arxiv:1301.3662, 2013.
    [Bibtex]
    @article{dunjko2013composable,
    title={Composable security of delegated quantum computation},
    author={Dunjko, Vedran and Fitzsimons, Joseph F and Portmann, Christopher and Renner, Renato},
    journal={arXiv preprint arXiv:1301.3662},
    year={2013},
    note={To appear in Proceedings of ASIACRYPT 2014}
    }
  • J. Fitzsimons, J. Jones, and V. Vedral, “Quantum correlations which imply causation,” Arxiv preprint arxiv:1302.2731, 2013.
    [Bibtex]
    @article{fitzsimons2013quantum,
    title={Quantum correlations which imply causation},
    author={Fitzsimons, Joseph and Jones, Jonathan and Vedral, Vlatko},
    journal={arXiv preprint arXiv:1302.2731},
    year={2013}
    }
  • J. Miyazaki, M. Hajdušek, and M. Murao, “An analysis of the trade-off between spatial and temporal resources for measurement-based quantum computation,” Arxiv:1310.4043, 2013.
    [Bibtex]
    @Article{miyazaki13,
    author = "J. Miyazaki and M. Hajdu\v{s}ek and M. Murao",
    title = "An analysis of the trade-off between spatial and temporal resources for measurement-based quantum computation",
    journal = "arXiv:1310.4043",
    year = "2013",
    }
  • K. Nakago, M. Hajdušek, S. Nakayama, and M. Murao, “Parallelized adiabatic gate teleportation,” Arxiv:1310.4061, 2013.
    [Bibtex]
    @Article{nakago13,
    author = "K. Nakago and M. Hajdu\v{s}ek and S. Nakayama and M. Murao",
    title = "Parallelized adiabatic gate teleportation",
    journal = "arXiv:1310.4061",
    year = "2013",
    }
  • Y. Ouyang, “Permutation-invariant quantum memories,” Arxiv preprint arxiv:1302.3247, 2013.
    [Bibtex]
    @article{ouyang2013permutation,
    title={Permutation-invariant quantum memories},
    author={Ouyang, Yingkai},
    journal={arXiv preprint arXiv:1302.3247},
    year={2013}
    }
  • [DOI] S. M. Cohen and L. Yu, “All unitaries having operator schmidt rank 2 are controlled unitaries,” Phys. rev. a, vol. 87, p. 22329, 2013.
    [Bibtex]
    @article{PhysRevA.87.022329,
    title = {All unitaries having operator Schmidt rank 2 are controlled unitaries},
    author = {Cohen, Scott M. and Yu, Li},
    journal = {Phys. Rev. A},
    volume = {87},
    issue = {2},
    pages = {022329},
    numpages = {6},
    year = {2013},
    month = {Feb},
    publisher = {American Physical Society},
    doi = {10.1103/PhysRevA.87.022329},
    url = {http://link.aps.org/doi/10.1103/PhysRevA.87.022329}
    }
  • [DOI] A. Mantri, C. A. Pérez-Delgado, and J. F. Fitzsimons, “Optimal blind quantum computation,” Phys. rev. lett., vol. 111, p. 230502, 2013.
    [Bibtex]
    @article{PhysRevLett.111.230502,
    title = {Optimal Blind Quantum Computation},
    author = {Mantri, Atul and P\'erez-Delgado, Carlos A. and Fitzsimons, Joseph F.},
    journal = {Phys. Rev. Lett.},
    volume = {111},
    issue = {23},
    pages = {230502},
    numpages = {5},
    year = {2013},
    month = {Dec},
    publisher = {American Physical Society},
    doi = {10.1103/PhysRevLett.111.230502},
    url = {http://link.aps.org/doi/10.1103/PhysRevLett.111.230502}
    }
  • P. P. Rohde, J. F. Fitzsimons, and A. Gilchrist, “Information capacity of a single photon,” Physical review a, vol. 88, iss. 2, p. 22310, 2013.
    [Bibtex]
    @article{rohde2013information,
    title={Information capacity of a single photon},
    author={Rohde, Peter P and Fitzsimons, Joseph F and Gilchrist, Alexei},
    journal={Physical Review A},
    volume={88},
    number={2},
    pages={022310},
    year={2013},
    publisher={American Physical Society}
    }