Dr Siddarth K Joshi


  • BS8 1UB


Research output per year

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Personal profile

Research interests

When you send a message, your personal data, bank transfers, medical records, and so much more over the internet, you want them to remain private. To do this communication is encrypted. But the best encryption you currently use can eventually be broken by powerful computers. I work on quantum communication – an encryption technique that is based on immutable and fundamental laws of physics to ensure that malicious decryption is impossible no matter how powerful a computer a hacker uses.

My focus is to bring these technologies out of the lab and into the real world. To this end I am working on building small satellites (small enough to hold in your hand) for global scale quantum communication, long distance fibre optic based quantum communication for terrestrial links and many user large and complex quantum networks to create the quantum internet.

I also work on quantum metrology (the science of measurements) and use the fascinating properties of quantum physics to make measurements more precise or even to be able to take images at one wavelength without ever detecting light at that wavelength.

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Research Output

Approaching the quantum limit of precision in absorbance estimation using classical resources

Allen, E., Sabines Chesterking, J. J., Mcmillan, A. R., Joshi, S. K., Turner, P. S. & Matthews, J. C. F., 12 Aug 2020, In : Physical Review Research.

Research output: Contribution to journalArticle (Academic Journal)

Open Access
10 Downloads (Pure)

Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre

Wengerowsky, S., Joshi, S. K., Steinlechner, F., Zichi, J. R., Liu, B., Scheidl, T., Dobrovolskiy, S. M., Molen, R. V. D., Los, J. W. N., Zwiller, V., Versteegh, M. A. M., Mura, A., Calonico, D., Inguscio, M., Zeilinger, A., Xuereb, A. & Ursin, R., 11 Jan 2020, In : npj Quantum Information. 6, 1, 5 p., 5 (2020).

Research output: Contribution to journalArticle (Academic Journal)

Open Access
  • 4 Citations (Scopus)
    79 Downloads (Pure)

    QUARC: Quantum Research Cubesat—A Constellation for Quantum Communication

    Mazzarella, L., Lowe, C. E., Lowndes, D., Joshi, S. K., Greenland, S., McNeil, D., Mercury, C., Macdonald, M., Rarity, J. & Oi, D. K. L., 27 Feb 2020, In : Cryptography. 4, 1, p. 7 25 p., 1.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
  • 55 Downloads (Pure)


    Twin-beam sub-shot-noise raster-scanning microscope

    Matthews, J. C. F. (Creator), Mcmillan, A. R. (Creator), Sabines Chesterking, J. J. (Creator), Joshi, S. K. (Contributor), Moreau, P. (Contributor), Knauer, S. (Contributor), Johnston, E. (Contributor) & Rarity, J. G. (Contributor), University of Bristol, 14 Oct 2019


    Data from "Demonstrating an absolute quantum advantage in direct absorption measurement"

    Matthews, J. C. F. (Creator), Birchall, P. M. (Contributor), Rarity, J. G. (Contributor), Mcmillan, A. R. (Contributor), Matthews, J. C. F. (Contributor), Joshi, S. K. (Contributor), Moreau, P. (Contributor), Whittaker, R. (Contributor) & Sabines-Chesterking, J. (Contributor), University of Bristol, 27 Jun 2017