Quantum Computation with Untunable Couplings
Open accessAbstract
Most quantum computer realizations require the ability to apply local fields and tune the couplings between qubits, in order to realize single bit and two bit gates which are necessary for universal quantum computation. We present a scheme to remove the necessity of switching the couplings between qubits for two bit gates, which are more costly in many cases. Our strategy is to compute with encoded qubits in and out of carefully designed interaction free subspaces analogous to decoherence free subspaces. We give two examples to show how universal quantum computation is realized in our scheme with local manipulations to physical qubits only, for both diagonal and off diagonal interactions.
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The spin-chain channel does not require the ability to switch interactions on and off, nor does it require modulation by external fields.
“neither does the spin chain channel require the ability to switch interactions 'on' and 'off' (often a problem in quantum computer implementations [4, 5]), nor does it require any modulation by external fields (essential for quantum computation).”
From Quantum Communication through an Unmodulated Spin Chain (2003) · cites this paper as [4]
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- Authors
- Zhou, X., Zhou, Z.-W., Guo, G.-C., & Feldman, M. J.
- Affiliations
- University of Rochester (US)
- University of Science and Technology of China (CN)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2002-10-21
- Volume
- 89
- Issue
- 19
- Pages
- 197903-197903
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W1979253254
- Cited by
- 76
- References
- 18
- Citations by year
- 2026: 1 · 2025: 1 · 2022: 2 · 2020: 3 · 2018: 1 · 2016: 3 · 2015: 4 · 2014: 1 · 2013: 2 · 2012: 2
- FWCI
- 10.39
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Keywords
- quantum computing, two-qubit gates, decoherence-free subspace, encoded qubits, universal quantum computation
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