Seth Lloyd, 64100 Memorial Dr, Cambridge, MA 02142

7764568, Jul 27, 2010

Jul 1, 2008

12/166307

Seth Lloyd - Wellesley MA, US
Vittorio Giovannetti - Pisa, IT
Lorenzo Maccone - Ivrea, IT

G11C 8/00

36523006, 36523008

In an address signal decoder for a RAM memory, address signals are decoded in a “bucket brigade” address decoding architecture in which the address signals or bits are sequentially sent along the same address decoding path. The inventive architecture comprises a set of node switches linked into a binary tree. The address signals enter at the root node of the binary tree. As each address signal reaches a node switch at the end the path, it sets the path direction for that switch node so that subsequent address signals that follow the path will use that path direction. The decoder can be used with classical or quantum RAM memories.

8126830, Feb 28, 2012

Jun 24, 2008

12/145050

Seth Lloyd - Wellesley MA, US
Vittorio Giovannetti - Pisa, IT
Lorenzo Maccone - Ivrea, IT

G06F 17/00

706 45, 707705

In a database query operation, a quantum private query (QPQ) protocol allows a user to determine whether the database provider has been trying to obtain information about their query by performing quantum superpositions of different queries in addition to performing normal queries. This means that, in addition to being able to request the jth or the kth records in the database, the user can also request both records in a quantum superposition. To find out whether the database provider is trying to discover her queries, the user sends proper superpositions of queries and then checks the answer provided by the database to determine whether the superposition has been preserved. If superposition has not been preserved, the user can be confident that the database provider has cheated, and has tried to obtain information on the query.

2004005, Mar 18, 2004

Jun 16, 2003

10/462580

Tal Mor - Qiryat Tivon IL, US
Vwani Roychowdhury - Los Angeles CA, US
Seth Lloyd - Wellesley MA, US
Jose Fernandez - Montreal, CA
Yossi Weinstein - Haifa, IL

G01V003/00

324/314000, 324/300000

A method for decreasing entropy of a quantum system of at least two subsystems, a first subsystem comprising elements with a first relaxation time (hereinafter—computation elements) and a second subsystem comprising elements with a second relaxation time (hereinafter—reset elements). The second relaxation time is shorter than the first relaxation time. The method comprises adiabatically manipulating the entropy of the elements in the system, by way of entropy compression, entropy transfer or both, so as to decrease the entropy of at least some computation elements, and to increase the entropy of at least some reset elements, so that the entropy of the subgroup of reset elements is overall increased; waiting for a time sufficiently longer than the relaxation time of the reset elements, and sufficiently shorter than the relaxation time of the computation elements for the total entropy of the subgroup of reset elements to decrease; and adiabatically manipulating the entropy of predetermined elements in the system, by way of entropy compression, entropy transfer or both, so as to decrease the entropy of at least some predetermined computation elements, and to increase the entropy of at least some predetermined reset elements, so that the entropy of the subgroup of reset elements is overall increased.

2021040, Dec 30, 2021

Jun 30, 2020

16/917710

- Cambridge MA, US
Seth Lloyd - Wellesley MA, US
Danna Rosenberg - Arlington MA, US
Michael O'Keeffe - Cambridge MA, US
Amy Greene - Mount Bethel PA, US
Morten Kjaergaard - Cambridge MA, US
Mollie Schwartz - Cambridge MA, US
Gabriel Samach - Cambridge MA, US
Iman Marvian Mashhad - Cambridge MA, US

Massachusetts Institute of Technology - Cambridge MA

G06N 10/00
H03M 13/00
H01L 39/10
G06F 11/00

Systems and methods for performing open-loop quantum error mitigation using quantum measurement emulations are provided. The open-loop quantum error mitigation methods do not require the performance of state readouts or state tomography, reducing hardware requirements and increasing overall computation speed. To perform a quantum measurement emulation, an error mitigation apparatus is configured to stochastically apply a quantum gate to a qubit or set of qubits during a quantum computational process. The stochastic application of the quantum gate projects the quantum state of the affected qubits onto an axis, reducing a trace distance between the quantum state and a desired quantum state.

2017029, Oct 12, 2017

Apr 12, 2017

15/486088

Jacob C. MOWER - Cambridge MA, US
Jelena NOTAROS - Cambridge MA, US
Mikkel HEUCK - Cambridge MA, US
Dirk Robert ENGLUND - Cambridge MA, US
Cosmo LUPO - Leeds, GB
Seth LLOYD - Wellesley MA, US

G02B 6/293
H04B 10/40
G02F 1/225

A large-scale tunable-coupling ring array includes an input waveguide coupled to multiple ring resonators, each of which has a distinct resonant wavelength. The collective effect of these multiple ring resonators is to impart a distinct time delay to a distinct wavelength component (or frequency component) in an input signal, thereby carrying out quantum scrambling of the input signal. The scrambled signal is received by a receiver also using a large-scale tunable-coupling ring array. This receiver-end ring resonator array recovers the input signal by imparting a compensatory time delay to each wavelength component. Each ring resonator can be coupled to the input waveguide via a corresponding Mach Zehnder interferometer (MZI). The MZI includes a phase shifter on at least one of its arms to increase the tunability of the ring array.