Experimental Demonstration of Sequential Quantum Random Access Codes

• URL: http://arxiv.org/abs/2001.04885v2
• Date: Thu, 20 Aug 2020 16:08:34 GMT
• Title: Experimental Demonstration of Sequential Quantum Random Access Codes
• Authors: Giulio Foletto, Luca Calderaro, Giuseppe Vallone, Paolo Villoresi
• Abstract summary: A random access code (RAC) is a strategy to encode a message into a shorter one in a way that any bit of the original can still be recovered with nontrivial probability. We show that weak measurements can allow two sequential decoders to perform better than with the best classical RAC.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A random access code (RAC) is a strategy to encode a message into a shorter one in a way that any bit of the original can still be recovered with nontrivial probability. Encoding with quantum bits rather than classical ones can improve this probability, but has an important limitation: due to the disturbance caused by standard quantum measurements, qubits cannot be used more than once. However, as recently shown by Mohan, Tavakoli, and Brunner [New J. Phys. 21 083034, (2019)], weak measurements can alleviate this problem, allowing two sequential decoders to perform better than with the best classical RAC. We use single photons to experimentally show that these weak measurements are feasible and nonclassical success probabilities are achievable by two decoders. We prove this for different values of the measurement strength and use our experimental results to put tight bounds on them, certifying the accuracy of our setting. This proves the feasibility of using sequential quantum RACs for quantum information tasks such as the self-testing of untrusted devices.

Related papers

• A Quantum-Classical Collaborative Training Architecture Based on Quantum State Fidelity [50.387179833629254]
  We introduce a collaborative classical-quantum architecture called co-TenQu. Co-TenQu enhances a classical deep neural network by up to 41.72% in a fair setting. It outperforms other quantum-based methods by up to 1.9 times and achieves similar accuracy while utilizing 70.59% fewer qubits.
  arXiv  Detail & Related papers  (2024-02-23T14:09:41Z)
• Simple Tests of Quantumness Also Certify Qubits [69.96668065491183]
  A test of quantumness is a protocol that allows a classical verifier to certify (only) that a prover is not classical. We show that tests of quantumness that follow a certain template, which captures recent proposals such as (Kalai et al., 2022) can in fact do much more. Namely, the same protocols can be used for certifying a qubit, a building-block that stands at the heart of applications such as certifiable randomness and classical delegation of quantum computation.
  arXiv  Detail & Related papers  (2023-03-02T14:18:17Z)
• Achieving metrological limits using ancilla-free quantum error-correcting codes [1.9265037496741413]
  Existing quantum error-correcting codes generally exploit entanglement between one probe and one noiseless ancilla of the same dimension. Here we construct two types of multi-probe quantum error-correcting codes, where the first one utilizes a negligible amount of ancillas and the second one is ancilla-free.
  arXiv  Detail & Related papers  (2023-03-02T00:51:02Z)
• Anticipative measurements in hybrid quantum-classical computation [68.8204255655161]
  We present an approach where the quantum computation is supplemented by a classical result. Taking advantage of its anticipation also leads to a new type of quantum measurements, which we call anticipative. In an anticipative quantum measurement the combination of the results from classical and quantum computations happens only in the end.
  arXiv  Detail & Related papers  (2022-09-12T15:47:44Z)
• Two instances of random access code in the quantum regime [0.09545101073027092]
  We consider two classes of quantum generalisations of Random Access Code (RAC) First class is based on a random access code with quantum inputs and output known as No-Signalling Quantum RAC (NS-QRAC) Second class is based on a random access code with a quantum channel and shared entanglement.
  arXiv  Detail & Related papers  (2022-08-30T17:43:37Z)
• Efficient Bipartite Entanglement Detection Scheme with a Quantum Adversarial Solver [89.80359585967642]
  Proposal reformulates the bipartite entanglement detection as a two-player zero-sum game completed by parameterized quantum circuits. We experimentally implement our protocol on a linear optical network and exhibit its effectiveness to accomplish the bipartite entanglement detection for 5-qubit quantum pure states and 2-qubit quantum mixed states.
  arXiv  Detail & Related papers  (2022-03-15T09:46:45Z)
• Dense Coding with Locality Restriction for Decoder: Quantum Encoders vs. Super-Quantum Encoders [67.12391801199688]
  We investigate dense coding by imposing various locality restrictions to our decoder. In this task, the sender Alice and the receiver Bob share an entangled state.
  arXiv  Detail & Related papers  (2021-09-26T07:29:54Z)
• Depth-efficient proofs of quantumness [77.34726150561087]
  A proof of quantumness is a type of challenge-response protocol in which a classical verifier can efficiently certify quantum advantage of an untrusted prover. In this paper, we give two proof of quantumness constructions in which the prover need only perform constant-depth quantum circuits.
  arXiv  Detail & Related papers  (2021-07-05T17:45:41Z)
• Widening the sharpness modulation region of an entanglement-assisted sequential quantum random access code: Theory, experiment, and application [2.531490578771959]
  We propose an entanglement-assisted sequential QRAC protocol which can enable device-independent tasks. We get more than 27 standard deviations above the classical bound even when both decoders perform approximately projective measurements. Our results may promote a deeper understanding of the relationship among quantum correlation, quantum measurement, and quantum information processing.
  arXiv  Detail & Related papers  (2021-04-30T03:27:28Z)
• Experimental characterisation of unsharp qubit observables and sequential measurement incompatibility via quantum random access codes [0.0]
  We report an experimental implementation of unsharp qubit measurements in a sequential communication protocol. The protocol involves three parties; the first party prepares a qubit system, the second party performs operations which return a classical and quantum outcome, and the latter is measured by the third party.
  arXiv  Detail & Related papers  (2020-01-14T13:37:04Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.